THOUGH the direct agglutination test in brucellosis is usually positive at a titre of 1/80 or over, there is a small proportion of bacteriologically proved cases which fail to show direct ...

Rotavirus is an important cause of childhood gastroenteritis resulting in dehydration, hospital admission and nosocomial infections. False negative antigen tests may lead to further unnecessary ...

Normal agglutinins are influenced to a considerable extent by the turbidity of an antigen. A definite ratio exists between the amount of serum and the number of organisms in the antigen when the titer ...