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The prothrombin time, partial thromboplastin time with kaolin, and thrombin clotting time of plasma derived from healthy human volunteers were unaltered after in vitro addition of therapeutic concentrations (20-90 ng ml-1) of ivermectin. No difference in these coagulation tests, relative to untreated controls, was observed after 12 hours' incubation with the drug.

The social interactions of male mice with subclinical congenital Toxoplasma infection towards their uninfected counterparts was assessed using a procedure based on the subdivision of behaviour into element groups. Infection had no effect on behavioural elements not directly associated with interaction. However infection was found to increase companion investigation as well as a number of elements directly associated with aggression. There was a complementary decrease in elements associated with flight behaviour. These findings suggest that congenital infection with Toxoplasma renders mice less cautious towards uninfected conspecifics and increases the tendency of adult male mice towards territorial aggression.

An observational study using video recordings and computer assisted data analysis showed that infection with Toxocara canis larvae had a marked effect on five readily and reliably differentiable categories of murine behaviour. The infection was also associated with an increase in the number of shorter bouts of each behavior. These results indicate that infection with T. canis renders mice hyperactive, and would appear to justify a complete reappraisal of the role of this neurotropic parasite as a cause of behavioural abnormalities such as hyperactivity in children.