a1 Department of Veterinary Pathology and Public Health, Massey University, Palmerston North, New Zealand
Streptococcus suis types 1 and 2 were detected in nasal swabs taken from five litters of piglets sampled twice weekly from birth. The two types had been detected in all pigs by the time they were 38 and 25 days old respectively with mean ages of first detectable infection being 13·5 and 8·5 days. The prevalence of infection was not affected by housing conditions or the population density of pigs. Piglets originating from a sow with vaginal swabs positive for S. suis type 2 were infected earlier than piglets from non-vaginal carriers. It is concluded that infection of piglets with S. suis type 2 may occur during the birth process.
(Accepted March 02 1991)
p1 Present address: School of Veterinary Studies, Murdoch Univrsity, Western Australia
p2 Present address: Wistar Institute, Philadelphia, USA