Abstract
On a field level among poultry flocks a study was conducted to estimate the efficacy of the most common disinfectants against E. coli (APEC isolates) was determined. The selected disinfectants were; Formalin, Phenol, QAC, Halamid, Virkon" S and Micro Sept M against E. coli isolates of commercial egg- layer flocks in Egyptian farms. The recovered results showed that: (1) the incidence of E. coli in the observed commercial egg-layer flocks; the isolation of E. coli (APEC of rfbO157 gene ) from 4 commercial egg-layer flocks (26.7 %) out of 15 flocks, the mortalities rates at the end of 78 weeks of age was 20% and also, the current egg-production, average egg weight, hen housed day, hen housed egg and percent peak of egg-production were: 69.2%,58.3 gm, 70%,326,78% and 69%,respectivel. (2) Formalin, Micro Sept M and Virkon'S treatment demonstrated a significant reduction in E. coli populations especially by cold fogging method.
Highlights
Colibacillosis, a syndrome caused by Escherichia coli, is one of the most common infectious bacterial diseases of the layer industry
While most strains are considered to be nonpathogenic, certain strains have the ability to cause clinical disease Polymerase chain reaction (PCR) analysis of E. coli O157 virulence markers revealed that all O157: H7/ isolates were positive rfbO157 (Table 1 and Fig.1) The incidence of E. coli in studied commercial egg-layer flocks; the isolation of E. coli was from 4 commercial egg-layers flocks (26.7 %) out of 15 flocks, and 18 isolates (Table 2 and Fig.2)
The results revealed that, there were a significant difference (P< 0.05) among the control flocks (Standard) and the infected ones by Escherichia coli
Summary
Colibacillosis, a syndrome caused by Escherichia coli, is one of the most common infectious bacterial diseases of the layer industry. Escherichia coli infection leads to high morbidity and mortality causing economic losses on a farm especially at the peak of egg production and at the production cycle. Infectious diseases of poultry are responsible for tremendous economic losses in the poultry production worldwide. Most of these diseases are caused by bacterial pathogens. Colibacillosis refers to any localized or systemic infection caused entirely or partly by avian pathogenic Escherichia coli [2]. It is an economic problem due to reduction of feed intake, growth retardation, uniformity reduction, and mortality as well as it causes respiratory problems and act as a welfare issue it is globally spreading infectious disease that represents a main concern in the poultry industry. It is an economic problem due to reduction of feed intake, growth retardation, uniformity reduction, and mortality as well as it causes respiratory problems and act as a welfare issue it is globally spreading infectious disease that represents a main concern in the poultry industry. [3]
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