Serological Tests

Abstract

1. Sera and antisera when kept in the dark at room temperature sealed in glass tubes occasionally give specific reactions after a period of 12 years. In most cases, however, negative results were obtained with the antisera, whilst in others the reactions were non-specific.2. Fowl blood will still give specific complement fixation and precipitin reactions after being in the alimentary canal of either Argas persicus or Ornithodorus moubata for at least 23 months. The gut contents of Pediculus vestimenti fed on man three days previously, also will give specific reactions with human antisera.