Pathomorphological studies of polyserositis in commercial caged layer chicken

Abstract

The present study revealed that the colisepticemia inducing E. coli isolates were derived from the layer house environment. Hence, the incidences of colisepticemia can be minimized by effectively reducing the bacterial load in the layer house environment through appropriate biosecurity measures.

Pathological changes associated with an outbreak of colibacillosis in a commercial broiler flock

“…The hepatic coagulative necrosis might be due to tissue hypoxia occasioned by vascular compromise (Myers et al, 2012). Similar focal necrosis and cellular infiltration were reported in the liver and heart of birds that came down with colibacillosis (Srinivasan et al, 2014). Likewise, congested central veins and sinusoids with cellular infiltration around the portal area were reported by El-Ghany & Madian (2011) in the livers of broiler chickens infected with E. coli.…”

“…Enlarged liver (hepatomegaly) with multiple necrotic foci was also reported in the livers of broilers and layers in natural colibacillosis outbreak in Eastern Sudan (Omer et al, 2010). Similarly, congested and haemorrhagic kidneys have been reported (Dutta et al, 2013), which might be due to vascular damage caused by E. coli endotoxin (Srinivasan et al, 2014). Histopathological evaluation showed severely damaged liver and moderately damaged spleen and heart with mildly damaged kidney, heart as well as lungs based on the DTC protocol.…”

“…However, E. coli infection in poultry is associated with varieties of disease conditions in poultry ranging from pericarditis, perihepatitis, airsacculitis, peritonitis, salpingitis, panophthalmitis, omphalitis, cellulitis, colisepticaemia, coligranuloma to swollenhead syndrome (Wray et al, 1996). Although pathological investigations of natural colibacillosis are well documented (Tonu et al, 2011;Bhalerao et al, 2013;Srinivasan et al, 2014), information on pathological changes associated with natural colibacillosis in broiler chickens in Nigeria is scanty, hence the need for the study. There is therefore, a need for continuous pathological evaluation of field cases of E. coli infection in broiler chickens in Nigeria, which is a viable part of the country's poultry industry.…”

Pathological, microbiological and immunohistochemical characterization of avian colibacillosis in broiler chickens of Mozambique

“…Many virulence factors have been demonstrated to play a crucial role in the pathogenicity of the strain (Nakazato et al 2009). In addition, E. coli is a commensal bacterium of the intestinal mucosa of birds (Giovanardi et al 2005, Srinivasan et al 2014, Guabiraba & Schouler 2015. The presence of some predisposing factors, such as stress, poor immune status, coinfections (Dziva & Stevens 2008, Oliveira et al 2019, physiological factors, environmental factors, as well as nutritional factors (Barnes et al 2008), are associated with clinical disease.…”

“…The presence of some predisposing factors, such as stress, poor immune status, coinfections (Dziva & Stevens 2008, Oliveira et al 2019, physiological factors, environmental factors, as well as nutritional factors (Barnes et al 2008), are associated with clinical disease. The disease may occur causing a massive mortality of poultry of multiple ages (Srinivasan et al 2014). The condition is worldwide distributed and constitutes one of the major challenges in industrial and subsistence poultry (Oliveira et al 2019, Kim et al 2020, mainly due to delayed development of affected birds, resulting in uneven batches (Ask et al 2006), decreased egg production and condemnation of carcasses at the slaughter (Barnes et al 2008, Al-Arfaj et al 2016.…”