Comparative susceptibility of chimpanzees and Macaca mulatta monkeys to oral administration of partially purified staphylococcal enterotoxin.

Effect of formaldehyde on the immunogenicity of staphylococcal enterotoxin B for Macaca mulatta.

Monkeys were immunized with enterotoxin and enterotoxoid by intracutaneous injection or by feeding. Identical schedules were used to compare the effectiveness of the two antigens and the two routes. Enterotoxin administered intracutaneously was the most effective antigen, whereas oral administration of enterotoxoid was least effective. Intracutaneous injection of toxoid and oral feeding of toxi...

Recognizing facial cues: individual discrimination by chimpanzees (Pan troglodytes) and rhesus monkeys (Macaca mulatta).

Faces are one of the most salient classes of stimuli involved in social communication. Three experiments compared face-recognition abilities in chimpanzees (Pan troglodytes) and rhesus monkeys (Macaca mulatta). In the face-matching task, the chimpanzees matched identical photographs of conspecifics' faces on Trial 1, and the rhesus monkeys did the same after 4 generalization trials. In the indi...

The composite face effect in chimpanzees (Pan troglodytes) and rhesus monkeys (Macaca mulatta).

The accurate recognition of individuals is a cornerstone of social exchange in primates. Current approaches to the study of individual recognition, however, are focused on human performance and only occasionally reference comparative research for support. A number of studies have suggested that humans can easily recognize thousands of individual faces and that this perceptual expertise is suppo...

Pathogenesis of lethal shock after intravenous staphylococcal enterotoxin B in monkeys.

The pathogenesis of shock in the rhesus monkey given intravenous staphylococcal enterotoxin B (SEB) is not understood. Several cardiovascular changes produced by a highly purified preparation of SEB were studied after administration of doses ranging from 50 to 1,000 mug/kg. Irreversible arterial hypotension was found consistently at the higher doses. Arterial blood pressure and cardiac output d...

Enzyme histochemistry of acute staphylococcal enterotoxin gastroenteritis in rhesus monkeys.