Abstract
An early and accurate diagnosis of septicemic salmonellosis is critical for implementing timely and proper treatment, prevention, and control measures. Here, we report a study on three outbreaks of septicemic salmonellosis in calves from Midwestern Brazil. the morbidity, mortality and lethality rates were of 10.55%, 2.79%, and 26.4%, respectively. Higher susceptibility was detected in Bos taurus than in Bos indicus cattle. Clinical manifestations consisted of apathy, hyperthermia, difficulty breathing and panting, and pallor of the mucous membranes. Chronic cases had necrosis of the tail tip and ears. Gross findings included enlarged liver, non-collapsed edematous lungs and diphtheritic enteritis. Significant histopathological changes included paratyphoid nodules in the liver and acute interstitial pneumonia. Salmonella enterica subsp. enterica serotype Dublin was detected by culture and by PCR from the blood of live calves, and from the spleen, liver, bile, mesenteric lymph node and lung samples of necropsied calves. We suggest that in clinical cases of septicemic salmonellosis, blood samples are better than fecal samples for detection of the agent, being a sound test to identify animal carriers in the herd.
Highlights
An early and accurate diagnosis of septicemic salmonellosis is critical for implementing timely and proper treatment, prevention, and control measures
Bovine salmonellosis is responsible for causing severe economic losses due to high mortality, especially in cases of the septicemic form caused by Salmonella enterica serotype Dublin
The three outbreaks occurred in Midwestern Brazil, in two counties in Mato Grosso do Sul (MS) state, namely Amambai and Juti
Summary
An early and accurate diagnosis of septicemic salmonellosis is critical for implementing timely and proper treatment, prevention, and control measures. Enterica serotype Dublin was detected by culture and by PCR from the blood of live calves, and from the spleen, liver, bile, mesenteric lymph node and lung samples of necropsied calves. Conclusions: We suggest that in clinical cases of septicemic salmonellosis, blood samples are better than fecal samples for detection of the agent, being a sound test to identify animal carriers in the herd. One of the main characteristics of Salmonella Dublin is its ability to induce a carrier state in cattle, in which bacteria are shed intermittently throughout life [2]. We report a study of three outbreaks of septicemic salmonellosis in calves and suggest a diagnostic protocol for the identification of carrier cattle
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