| environmental temperature on the vector competence of culex univittatus (diptera: culicidae) for west nile virus. | the effects of the extrinsic incubation temperature on the vector competence of culex univittatus theobald for west nile (wn) virus were studied. a mean titer of 7.0 log10 cpd50/ml of mosquito suspension was reached in orally infected mosquitoes after 11, 15, and 16 d of incubation at 26 and 30 degrees c and at fluctuating temperatures in an outside cage (mean temperature, 23.5 degrees c), respectively. in contrast, 22 and 58 d were required to reach the same titers at 18 and 14 degrees c, respe ... | 1993 | 8459423 |
| respiratory health and immunological profile of poultry workers. | to examine work-related respiratory symptoms in poultry workers, and to test for immunologically mediated responses to poultry-related agents. | 1998 | 9798499 |
| microbiological hazard identification and exposure assessment of street food vending in johannesburg, south africa. | one hundred and thirty-two samples of beef, chicken, salad and gravy were collected from two street vendors over eleven replicate surveys to assess microbiological safety and quality. for each food type samples were collected during preparation and holding. dish water was also collected and food preparation surfaces swabbed during preparation and display. standard methods were used to determine aerobic plate counts, enterobacteriaceae counts, coliform counts and spore counts. six hundred and sev ... | 2000 | 11078164 |
| an outbreak of food poisoning among children attending an international sports event in johannesburg. | to describe an outbreak of food poisoning at a major international sports event in johannesburg and to determine the likely cause and source of the outbreak. | 2001 | 11455807 |
| antimicrobial susceptibility in thermophilic campylobacter species isolated from pigs and chickens in south africa. | campylobacter jejuni is one of the leading causes of sporadic food-borne bacterial disease in humans. in intensive poultry and pig rearing systems the use of oral antibiotics is essential to maintain health. consequently, there is a high risk for the thermophilic campylobacter jejuni and c. coli resident in the intestinal tract of food animals to develop resistance to commonly used antibiotics. contamination of meat or eggs with pathogenic strains of resistant campylobacter could, therefore, res ... | 2010 | 21526738 |
| avian gyrovirus 2 and avirulent newcastle disease virus coinfection in a chicken flock with neurologic symptoms and high mortalities. | a disease with severe neurologic symptoms caused 100% mortality in a small broiler operation in the gauteng province, south africa in late march 2013. routine diagnostic pcr testing failed to identify a possible cause of the outbreak; thus, samples were submitted for virus isolation, serology, and bacteriology. an avirulent newcastle disease virus (ndv) strain isolated was identified as a v4-like genotype 1 strain, by dna sequencing, with a cleavage site of 112gkqgr decrease l117. real-time reve ... | 2014 | 24758119 |