North Vietnam Research Articles

Genetic detection and analysis of porcine norovirus in pigs farmed in north Vietnam

Norovirus (NoV) causing gastroenteritis symptoms, which has been reported in several hosts, including humans, pigs, and rats. This study was conducted to identify porcine viral infection and to characterize NoV strains from pigs in some provinces in north Vietnam. Totally, 102 fecal samples from diarrheal pigs on farms in six cities and provinces in northern Vietnam during July 2022 to March 2023 were collected. Polymerase chain reaction was used to identify the viral genome. Positive samples were used for nucleotide sequencing of the partial RNA-dependent RNA polymerase gene sequence. Five (4.9 %) positive stool samples were detected from animals farmed in five different farms, with one positive animal identified in each farm. Genetic analysis indicated that nucleotide identity was in the range 97.77–99.62 % among the 5 NoVs in this study. Phylogenetic analysis pointed out that the five NoVs were Genotype II.19 viruses. Genetically, these strains were closely related to porcine NoV strains that were reported in China in 2009.

Analysis of Magnetotelluric Response Functions at the Cam Thuy Site, Northern Vietnam

During magnetotelluric studies in North Vietnam, an effect where the impedance phases Zxy and Zyx simultaneously left their quadrants was detected at one of the sounding sites, CTH, in the Cam Thuy District, Thanh Hoa Province. Investigation of this phenomenon has shown that it is accompanied by negative (bottom-up directed) components of the Umov–Poynting vector of electromagnetic energy flux density in the entire range of the recorded periods of magnetotelluric variations. This direction of the energy flux remains unchanged when the initial coordinate system is rotated by angles of 45° and 60°. Another characteristic feature of this phenomenon is an unusual behavior of the apparent resistivity curves: the apparent resistivity values increase starting from a period of 200 s up to a period of 104 s, and this increase occurs practically along the asymptote. The analysis of the polarization of the magnetotelluric field and the asymmetry parameter (skew angle) β of the phase tensor has shown that the section exhibits significant three-dimensional distortions as manifested by β values ranging from 20° to 90°.

Selective Dorsal Rhizotomy for Spastic Cerebral Palsy: Report of 18 Cases Performed in the North of Vietnam

The purpose of this report is to describe a case series of children undergoing selective dorsal rhizotomy (SDR) for the treatment of spastic cerebral palsy in Vietnam. Also described is an international cooperation model to facilitate the development of a new, multidisciplinary team for the evaluation and treatment of these children. Details of international collaboration are described, including in-person travel and virtual interactions. All cases of children younger than 18 years undergoing SDR for treatment of spastic cerebral palsy at a single center in Hanoi, Vietnam are described, including preoperative evaluation of spasticity and gait as well as results at 6 and 12 months. Results are summarized using descriptive statistics. Since the beginning of cooperation in training and transferring SDR techniques by experts from the United States, in the period from June 2016 to December 2022, 18 SDR surgeries were performed in Hanoi. Patients' ages ranged from 2 to 14 years; 13 were male and 5 were female. Overall, approximately 60% of nerve rootlets were cut. Modified Ashworth Scale scores at 6 and 12 months after surgery in the hip, knee, and ankle joints showed improvement from preoperative values. There were 2 recorded complications: intracranial hypotension causing subdural hemorrhage and a case of skin infection at the incision site. The ongoing international cooperation between Vietnamese and American physicians has helped improve the surgical treatment of spasticity in children with cerebral palsy in Hanoi, providing children with a surgical treatment option with successful outcomes.

Duck Tembusu virus in North Vietnam: epidemiological and genetic analysis reveals novel virus strains.

Tembusu virus (TMUV) is an important infectious disease, causing economic losses in duck production. Since the first report of TMUV infection in Vietnam in 2020, the disease has persisted and affected poultry production in the country. This study conducted epidemiological and genetic characterization of the viral strains circulating in north Vietnam based on 130 pooled tissue samples collected in six provinces/cities during 2021. The TMUV genome was examined using conventional PCR. The results indicated that 21 (16.15%) samples and 9 (23.68%) farms were positive for the viral genome. The positive rate was 59.26% for ducks at ages 2-4 weeks, which was significantly higher than for ducks at ages >4 weeks and < 2 weeks. Genetic analysis of the partial envelope gene (891 bp) sequences indicated that the five Vietnamese TMUVs shared 99.55-100% nucleotide identity, while the rates were in the range 99.59-100% based on the pre-membrane gene sequences (498 bp). The five Vietnamese TMUV strains obtained formed a novel single subcluster. These strains were closely related to Chinese strains and differed from the vaccine strain, suggesting that Vietnamese TMUV strains were field viruses. It needs to be further studied on vaccine development to prevent effects of TMUV infection on poultry production across Vietnam.

Anthropogenic particle abundance and characteristics in seawater and intertidal sediments of the Tonkin Bay Coast (North Vietnam).

Microplastics (MPs, plastic items from 1µm to 5mm in size) are present in all environmental compartments. The evaluation of their concentration, fate, and spatial distribution is still a challenge for the scientific community. This concern is just debuting in developing countries, (i.e., Asia, South America, and Africa). This study deals with the MP contamination in the abiotic marine compartments of Northern Vietnam: seawater and intertidal sediments. Four sites located in the intertidal zone or near the coastline in Tonkin Bay, Vietnam were studied. A total of 16 samples (eight for each compartment) were collected in July 2020 (rainy season) and January 2021 (dry season). Anthropogenic particles (total observed fibers and fragments) were found at levels ranging from 3 to 303 particles/m3 in seawater and from 63 to 955 particles/kg dry weight in sediments. Most of these were fibers less than 300-µm long. Higher levels of seawater at the Nam Dinh site were found in the rainy season compared to the dry one. As the river flow was estimated six times higher during the rainy season than during the dry season, these results suggest the river discharge is a potential source of contamination for the coastal zone. The temporal variability was lower for the sediments than for the seawater, suggesting the long-term integration of the anthropogenic particles in this compartment. A small portion of sorted particles were analyzed by µFTIR (8.35%), and this sub-sample was only composed of fragments. Still, fragments were mostly composed of polypropylene (PP, 82%), polyethylene (PE, 9%), and polystyrene (PS, 9%). The fragment size was similar in the two studied compartments, but it was dependent on polymer types since PS fragments (140 ± 17µm) were smaller than those made of PE (622 ± 123µm) and PP (869 ± 905µm). Future works should investigate the smallest fraction of MP (even nanoplastics) as well as find solutions in order to mitigate MP contamination in the marine environment.

Isolation and genetic characterization of waterfowl parvovirus in ducks in Northern Vietnam.

Short beak and dwarfism syndrome (SBDS), a highly contagious disease, has been reported in duck farms in Vietnam since 2019. In this study, we evaluated the virulence and characterized the virus obtained from SBDS cases in North Vietnam. Polymerase chain reaction was used to detect waterfowl parvovirus in ducks, and the virus from positive samples was inoculated into 10-day-old duck-embryonated eggs to reproduce the disease in young ducklings to determine the virulence and subjected to phylogenetic analysis of non-structural (NS) and VP1 gene sequences. Goose parvovirus (GPV) was isolated from ducks associated with SDBS in Vietnam. The virus Han-GPV2001 is highly virulent when inoculated into 10-day-old duck embryos and 3-day-old ducklings. The mortality rate of duck embryos was 94.35% within 6 days of virus inoculation. Inoculating 3-day-old ducks with the virus stock with 104.03 EID50 through intramuscular and neck intravenous administration resulted in 80% and 66.67% of clinical signs of SDBS, respectively, were shown. Phylogenetic analysis based on the partial NS and VP1 gene sequences revealed that the viral isolate obtained in this study belonged to novel GPV (NGPV) and was closely related to previous Vietnamese and Chinese strains. A GPV strain, Han-GPV2001, has been successfully isolated and has virulence in duck-embryonated eggs as well as caused clinical signs of SBDS in ducks. Phylogenetic analyses of partial genes encoding NS and capsid proteins indicated that the obtained GPV isolate belongs to the NGPV group.

Surface water quality modelling with data scarcity in semi-enclosed coastal regions encompassed distributed islands

Water quality variation in semi-enclosed urban coastal areas with different pollutant sources is a substantial issue. Pollutant entrapment has a significant impact on the lives of the local people. Surface water quality modelling often requires large datasets covering bathymetry, fluid and pollutants boundary conditions, sources and sinks. This is particularly challenging in regions with complex features and poor data availability, such as coastal water bodies featuring a large number of widely distributed islands and estuaries. In this paper, we developed a model of surface water quality and hydrodynamics for Ha Long Bay, in the North of Vietnam and includes 1969 islands, for a one-year period using a water quality dataset obtained for this study. The model utilized extracted bathymetric and geometric data from Admiralty Charts and Admiralty Tide Tables. Water quality coupled with the TELEMAC Model (WAQTEL) Biomass Module was employed to predict pollutant transport in the domain using point and diffused sources while field studies were conducted to collect data for the setting up and calibration of the water quality model. Thirty scattered sampling points were selected, and the water quality parameters were measured during two campaigns. The predicted water level and velocity values matched the local observation data well with a small error (RMSE = 0.19 and 0.16). Both NO3−-N and PO43--P were high near the shoreline and decrease gradually offshore. The maximum concentrations of NO3−-N and PO43--P reached 0.476 mg/L and 0.048 mg/L at the end of 2021 with the RMSE = 0.13 and 0.011, respectively. The levels of NO3−-N and PO43--P and their distributions showed that Ha Long Bay was eutrophic even during the COVID-19 lockdown period.

Kajian Bentuk Arsitektur Batak Toba dan Toraja sebagai Hasil Memori Kolektif Austronesia

Title: Study of Toba and Toraja Batak Architectural Forms as a Result of Collective Austronesian Memory The archipelago (Indonesia) that we live in today is the distribution of the Austronesian people who lived in riverine areas in South China and North Vietnam in the mid-4th BC. Cultural development in an area results from a mixture of internal and external things. The mixing of culture and art by early settlers and new settlers resulted in diverse architectural forms, even though they share the same principles of traditional values (Austronesian collective memory). Toba and Toraja Batak architecture is hollow architecture with a similar roof shape that resembles the shape of a boat, a typology of houses and barns facing each other, and a housing complex oriented to form a particular axis. This research used an exploratory-qualitative approach, using literature sources combined with direct observations in the field. This research aims to find the level of closeness between Toba and Toraja Batak architecture based on the collective memory of the Austronesian people.

Prevalence of Accidents and Injuries and Related Factors of Fishermen Fishing Offshore in the North of Vietnam

Introduction: Seafaring, particularly offshore fishing, exposes fishermen to various occupational risks leading to diseases and injuries. This study aimed to determine the prevalence of occupational risks, injury accidents, and contributing factors among offshore fishers in North Vietnam, to develop evidence-based recommendations to enhance their safety and well-being. Methods: A cross-sectional study was conducted involving 420 fishermen with a minimum of two years of experience. Interviews were conducted between 2018 and 2020. Results: The findings indicated that there is a 41.7% prevalence of accidents and an average injury rate of 280.2 per person per year. Most incidents occurred at night with 104 cases (59.4%), slips and falls 48 cases (27.4%), broken winch lines 40 cases (22.9%), and ship collisions 14 cases (8.0%) being the primary causes. The most common injuries included soft wounds in 92 cases (52.5%) and sprains/dislocations in 14 cases (8.0%). Fishermen with fewer than 10 years of experience exhibited a higher accident risk (odds ratio = 1.54; 95% confidence interval: 1.05-2.72), as did those in the role of a fisherman (odds ratio: 1.68; CI: 0.97-2.94) and those working without labor protection (odds ratio: 3.68; CI: 1.05-12.93). Conclusion: Lack of labor protection equipment increased the risk by 3.68 times, and fishermen in the friend group had a 2.02 times higher risk of injury. Addressing these risks requires adherence to labor protection regulations and safe working procedures.

Paleolithic Nguom Culture of Northern Vietnam

Purpose. In North Vietnam, the Nguomian culture has been distinguished, which is characterized by the predominance of flake tools in the techno-typological complex. This industry dates back to the second half of the Upper Pleistocene, preceding the previously identified Sonvian and Hoabinhian. The purpose of this study is to determine the technical and typological characteristics of one of the key monuments of the Nguom industry – the Nguom Rockshelter. For this purpose, a technical and typological analysis of the collection of stone products obtained as a result of excavations in 1981–1982 was carried out.Results. In 2023, 4 589 artifacts of the Nguom Rockshelter were processed, of which 2 437 items were medium and small flakes and 1 284 fragments. The primary splitting of archaeological material is dominated by parallel cores (35 specimens), there are variants of unsystematic (12 specimens) and radial (8 specimens) cores, many core-like fragments (121 specimens). The tool set is represented by a large number of side-scrapers made of flakes and pebbles (22 specimens), retouched flakes with ventral undercut (43 specimens), choppers (25 specimens), adze-shaped objects (6 specimens), and fragmented axes (9 specimens), notched tools (5 copies). There are 25 punctures, 9 checks. Notched tools were mentioned earlier, but a group of artifacts (9 specimens) made of medium flakes should be separately distinguished. The number of single side scrapers is 10 pieces. Of interest is the category of rectangular scrapers with retouching on ¾ of the perimeter, numbering six objects. A series of oval scrapers (10 specimens) is close in shape. End and double scrapers have 52 items. The stone industry of the Nguom Rockshelter can be defined as a flake industry with medium and small tools.Conclusion. In the Late Paleolithic in southern China and Vietnam, both pebble and flake industries coexisted. As in Vietnam, flake complexes are sporadic in South China. These sites are characterized by a large number of tools made of small and medium flakes, simple parallel splitting without preliminary preparation, and the predominance of scrapers in the tool set. The manifestation of the Nguom culture can presumably be considered as a result of the mixing of the alien population in the territory of Southern China and Northern Vietnam with the local original culture in the late Pleistocene.

First record of the genus Chinapotamon Dai &amp; Naiyanetr, 1994 (Crustacea: Decapoda: Brachyura: Potamidae) from northern Vietnam with description of one new species

Our recent surveys in North Vietnam found three species of the potamid genus Chinapotamon Dai &amp; Naiyanetr, 1994. Two species may be identified as species described from Southern China, C. depressum (Dai, Song, Li &amp; Liang, 1980) and C. pusillum (Song, 1984), and one species is new to science. The new species can be distinguished from other congeners by its smaller carapace size, more subquadrate carapace, strongly convex and rugose carapace dorsal, low epigastric and postorbital cristae, high epibranchial tooth, deep notch between epibranchial tooth and anterolateral margin, deep concavity between frontal margin lobes, stout last ambulatory merus, narrow telson, slender gonopod 1 terminal segment bent at about 10° inwards and a relatively short gonopod 2. It is the first record of this genus in Vietnam. The present study raises the total number of freshwater crab species belonging to Potamidae in Vietnam to 60.

Pisachini planthoppers of Vietnam: new records of Pisacha and a new Goniopsarites species from Central Vietnam (Hemiptera, Fulgoromorpha, Nogodinidae).

Two planthopper species of the family Nogodinidae are added to the fauna of Vietnam, both from two localities in Thua Thien-Hue Province: Bach Ma National Park and Phong Dien District. The first species belongs to Goniopsarites Meng, Wang & Wang, 2014, G.mientrunganus Constant & Pham, sp. nov., and the second belongs to Pisacha Distant, 1906, P.yinggensis Meng, Wang & Wang, 2014. Pisachayinggensis was previously recorded from Hainan Island, China. These new records greatly extend the distribution of both genera, which were known from southern China, Hainan and North Vietnam, to the south, reaching the mid area of Central Vietnam. Sexual dimorphism is reported in P.yinggensis for the first time. Illustrations of habitus and male terminalia of the new species are given as well as distribution maps and photographs of live specimens and their habitat. The family Nogodinidae now comprises nine species in Vietnam, with three of them present in Bach Ma National Park.

Thermochronology of the Laojunshan–Song Chai Granite Gneiss Massif (North Vietnam, South China)

A reconstruction of the tectonothermal evolution of the Laojunshan–Song Chai granite gneiss massif (North Vietnam, South China) was carried out, based on summaries of the latest isotopic and fission-track dating results. The recorded wide range (420–465 Ma) of the age of granite gneiss rocks testifies to the long-term existence of a partially molten layer at a depth of 20–30 km for several tens of Ma. By the Devonian–early Carboniferous, a section of the excessively thickened crust was denudated, the massif was exhumated to the level of the upper crust, and isotope systems were “frozen”. The rate of uplift of the rocks of the massif is estimated to be about 0.2–0.5 mm/year. In the further history of the granite gneiss massif, episodes of repeated burial to a depth of about 13 km are recorded, associated with the Indosinian collision. The rocks have experienced metamorphism of the amphibolite-green schist facies, accompanied by tectonic transport in the form of a thrust sheet. Over the next 200 Ma, the uplift of the massif and the erosion of the overlying strata occurred in discrete pulses, during a sequence of active tectonic events. Thus, the thermochronological and P-T history of the Laojunshan–Song Chai massif is a kind of chronicle of regional tectonic–thermal events. In the history of the massif, traces of two orogenic cycles associated with the collision of the Cathaysia and Yangtze blocks in the Lower Paleozoic and the Indosinian collision in the Triassic are recorded.

Antimicrobial activity assessment of crude broth fermented extracts of marine-derived fungi collected from Bai Tu Long bay (North Vietnam)

This study aimed to isolate and identify marine fungi from Bai Tu Long Bay and assess their antimicrobial potential. We successfully isolated twenty strains of marine-derived fungi. The crude extracts from these fungi were tested against pathogenic microorganisms. All twenty strains exhibit some degree of growth inhibition against the tested microorganisms. Notably, strains M223, M250, M253, and M256 showed significant antimicrobial activity, with MIC values equal to or lower than the positive control. These results highlight the potential of marine fungi as a rich source of antimicrobial agents, a finding of considerable importance to marine mycology and pharmaceuticals. Further analysis was conducted on four promising isolates. M253 was identified as Hamigera avellanea, while M223, M250, and M256 were found to belong to the Aspergillus genus. These isolates were then analyzed using a phylogenetic tree based on MegaX software.

National liberation by other means: US visitor diplomacy in the Vietnam War

Abstract This article considers Americans who travelled to North Vietnam at the height of the Vietnam War (1965–75). It demonstrates, on the basis of revelations in files from the Vietnamese national archives, that authorities in Hanoi exercised far more control over visits by US citizens and the impressions they created than the visitors themselves and those who have written about them had heretofore surmised. In visiting North Vietnam on Hanoi’s very specific terms, guests unwittingly — for the most part — became accomplices in its ‘diplomatic struggle’, a distinctive aspect of the Vietnamese communist anti-American strategy that was intended to diminish the importance of the military contest inside Vietnam by winning hearts and minds and demonizing Washington policy makers outside the country. By elucidating Hanoi’s rationale for and contributions in arranging the visits, the article decentres the history of the Vietnam War and validates the emergent consensus among international relations historians that traditionally marginalized ‘Third World’ state and non-state actors assumed meaningful roles in shaping the post-1945 international order. The Vietnam War, it turned out, changed the global discourse on the laws of war, human rights and humanitarianism in no small part because of the way Hanoi framed the conflict and reported its dreadful effects to foreign publics.

The genus Dedalopterus Sabatinelli & Pontuale, 1998 (Scarabaeidae: Melolonthinae: Leucopholini) in Laos and Vietnam, with description of a new species.

The genus Dedalopterus Sabatinelli & Pontuale, 1998 from Laos and Vietnam is reviewed: three species are present of which Dedalopterus lexuanhuei Pham, Ahrens & Sabatinelli, new species from Central Vietnam (Ngoc Linh Mts., Annamite Range) is here described. Dedalopterusmalyszi Bunalski, 2001 is present in North Vietnam (Lao Cai, Hoang Lien Son Range), and Dedalopterus pulchellus Sabatinelli & Pontuale, 1998 (= D.bezdekorum Zdek & Krajk, 2007, new synonymy) is known from Northeast Laos (Mt. Xiangkhouang and Mt. Phou Pan). Additional records, an updated checklist, and an identification key of the genus Dedalopterus are provided. All species treated are abundantly illustrated.

Remote influence on regional scale intraseasonal rainfall variability over Vietnam

AbstractRemote influences on intraseasonal anomalous rainfall over regions that encompass North and South Vietnam are explored using a 38‐year (1979–2016) global dataset over the extended summer (May–October). Wet and Dry composites in filtered daily data with lags of up to 2 weeks are assembled for various rainfall indices over the two subregions, including atmospheric reanalysis products and in‐situ rainfall data. On the regional scale, the moisture flux convergence correlates well with reanalysed rainfall. The large‐scale dynamics associated with these composites are described. Rainfall composites of opposing signs show asymmetrical large‐scale precursors and different pathways of influence. Wet and Dry anomalies in North Vietnam are seen to originate from Europe and propagate at high latitudes. The exact nature of the precursors is sensitive to the definition of the composite index. There is also a pathway of influence along the Asian jet, which impacts South Vietnam, especially for Wet composites which often coincide with Dry conditions in the North. South Vietnam is also influenced by tropical divergent precursors, which are again asymmetric between Wet and Dry composites.

Environmental influence on abundance and infection patterns of snail intermediate hosts of liver and intestinal flukes in North and Central Vietnam.

Liver and intestinal flukes (LIF) are important groups of foodborne zoonotic trematodes (FZTs) in Southeast Asia, including Vietnam. Their complex life cycles require specific freshwater snail species as the obligatory first intermediate hosts. In 2019, we conducted a longitudinal study in Yen Bai and Thanh Hoa provinces in North and Central Vietnam, respectively, to investigate the diversity of LIF and their infection prevalence in relation to snail host abundance and environmental factors. Using a combination of morphological and molecular identification techniques, we identified 10 LIF species infecting 11 snail host species. We observed significant seasonal variation in the mean abundance of several snail host species, with the majority of snails collected during the spring. We also detected seasonal changes in LIF species composition, with the highest species richness reported in the spring. Clonorchis sinensis and Fasciola gigantica, two medically important human liver flukes in Asia, were found only in the spring in Yen Bai. Our study revealed that not all snail host species have the same probability of becoming infected, and we recorded seasonal variations in the prevalence of LIF infection in different snail species in relation to water parameters.

Examining the Association between Psychosocial Support and Resilience in People Diagnosed with Infertility

Infertility and infertility treatment cause great suffering for individuals and couples, particularly when they lack psychosocial support and resilience. The purpose of the study was to examine the association between the role of psychosocial support and resilience in 152 infertility patients at 2 hospitals in North Vietnam. Participants completed the Connor–Davidson Resilience Scale (CD-RISC) and The Multidimensional Scale of Perceived Social Support (MSPSS). The findings demonstrated that resilience in infertility patients, both generally and specifically in women, was significantly predicted by support from friends and family. Meanwhile, psychosocial support sources have no effect on resilience in infertile men. The findings highlight the importance of psychosocial support for people diagnosed with infertility in the Vietnamese cultural context.

Sixteen issid planthopper species in one day in Dong Son-Ky Thuong Nature Reserve in North Vietnam: Eight new species, one new genus and additional new records (Hemiptera: Fulgoromorpha: Issidae)

Sixteen species of Issidae (Hemiptera: Fulgoromorpha) were recorded in a single day of collecting in Dong Son-Ky Thuong Nature Reserve, Quang Ninh Province, Vietnam, of which a checklist is provided. Among them, eight species are new to science and described in different tribes and subtribes: in the Hemisphaeriini Hemisphaeriina: Gergithoides olivaceus sp. nov., Hemisphaerius bresseeli sp. nov. and Neogergithoides scapularis sp. nov.; Hemisphaeriini Mongolianina: Mongoliana vietnamica sp. nov.; Kodaianellini: Kodaianella mua sp. nov.; Parahiraciini Parahiraciina: Pusulissus quangninhensis sp. nov. and Rostrolatum curviceps sp. nov.; Sarimini: Pseudocoruncanius obliquus sp. nov. The new genus Melichergithus gen. nov. is described to accommodate Gergithus gravidus Melichar, 1906 and the new combination Melichergithus gravidus (Melichar, 1906) gen. et comb. nov. is proposed; a black form of the species is recorded for the first time and described. Two species, Longieusarima lunulia Wang, Bourgoin &amp; Zhang, 2017 and Parallelissus fuscus Meng, Qin &amp; Wang, 2020, are recorded from Vietnam for the first time, while another species Maculergithus luteomaculatus (Constant &amp; Pham, 2016) is recorded for the first time from Quang Ninh Province. Four species were represented by single females that could not be identified to species level, belonging to the genera Clypeosmilus Gnezdilov &amp; Soulier-Perkins, 2017, Fortunia Distant, 1909 (two species) and Kodaianellissus Wang, Bourgoin &amp; Zhang, 2017. The five following genera are recorded from Vietnam for the first time: Kodaianella Fennah, 1956, Rostrolatum Che, Zhang &amp; Wang, 2020, Longieusarima Wang, Bourgoin &amp; Zhang, 2017, Parallelissus Meng, Qin &amp; Wang, 2020 and Kodaianellissus. The type material of Hemisphaerius rufovarius Walker, 1858 and its junior synonyms H. scymnoides Walker, 1862, H. testaceus Distant, 1906 and H. virescens Distant, 1906 was studied and the male terminalia described; as a result, H. rufovarius is removed from the fauna of Vietnam and China. Hemisphaerius bipunctatus Melichar, 1906 is also removed from the fauna of Vietnam after examination of the corresponding specimens. This study provides a 25% increase in the number of Issidae of Vietnam; a complete list of the 51 species recorded from the country, as well as a map of the number of recorded species per province, are given and discussed.