Abstract
The aim of this study was to investigate the pathogen types in milk samples of cows with clinical mastitis and the sensitivity of isolated bacteria to various antibacterial drugs, in Adana region, Turkey. The study was carried out on 103 milk samples collected from dairy cows with clinical mastitis. Microbiological identification and isolation were performed to identify gram negative and gram positive bacteria, Mycoplasma bovis and fungi. Then, bacteria isolated from infected milks were subjected to in vitro antibiotic sensitivity testing, using 27 antimicrobials agents. As a result, a total of 146 microorganisms isolates were obtained from 103 milk samples. The predominant pathogen isolates recovered were fungi (21.9%), Escherichia coli (19.9%) and Staphylococcus aureus (13.7%), followed by Mycoplasma bovis (8.2%) and Streptococcus uberis (6.8%). The mixed predominant pathogen was fungi, (75%) the majority of which mixed with gram positive bacteria. Ampicillin, imipenem, Chloramphenicol and Streptomycin were the least effective antimicrobial agents, while the most effective antibiotics were Florfenicol, followed by Amikacin and Kanamycin / Cefalexin. In conclusion, the types of microorganisms that cause mastitis and the antibiogram results of the bacteria isolated varied. Most importantly, fungal mastitis is a serious problem, should always be considered before routine antibiotic therapy.
Highlights
The mixed predominant pathogen was fungi, (75%) the majority of which mixed with gram positive bacteria
A total of 146 microorganisms isolates were obtained from 103 milk samples collected from 103 cows with clinical mastitis
The predominant pathogen isolates recovered were fungi, E. coli and S. aureus followed by M. bovis and S. uberis
Summary
Mastitis is the most common and the most costly production disease in the dairy herds (Abebe et al 2016; Dalanezi et al 2020) and it is an account for 38% of total economic losses caused by production diseases (Bradley 2002). Mastitis occurs in clinical and subclinical forms and their average incidence was reported as 14.2% and 30%, respectively (Sundrum 2015). It has a serious zoonotic risk due to the presence of bacteria
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