a1 School of Veterinary Studies, Murdoch University, Perth, 6150, Australia
a2 Institute of Medical Research, Goroka, Eastern Highlands Province, Papua New Guinea
An indirect fluorescent antibody test was used to detect the presence of Streptococcus suis type 2 in nasal and pharyngeal swabs taken from pigs in Papua New Guinea. The rate of carriage for the two sites in domesticated indigenous village pigs was 0·5 and 2·5% respectively, compared to 39 and 43% for intensively reared pigs. These findings were supported by the results of a serological survey, using an enzyme linked immunosorbent assay, in which 87% of intensively reared pigs but only 8% of village pigs were seropositive to S. suis type 2.
It is proposed that in intensive piggeries S. suis type 2 is continually cycled between pigs. In village pigs, the low population density and harsh environmental conditions prevents this cycle of infection.
(Accepted September 01 1992)
c1 I. D. Robertson, School of Veterinary Studies, Murdoch University. Perth, 6150, Western Australia.