Method and apparatus for determining air borne bacteria.

摘要

Provided is a method and apparatus for determining air borne bacteria which comprises successive steps of passing a volume of air by a suction pump means (30) through a membrane filter (25) at a membrane passing velocity of not more than 15 cm/sec and under a constant transmembrane pressure of not more than 100 mmHg to collect the air borne bacteria on the surface of said membrane filter, said membrane filter having a multiplicity of minute holes and provided on a medium-absorbing pad housed in a holder (2); injecting a medium into said medium-absorbing pad housed in said holder; incubating the bacteria thus collected; and measuring the number of the colonies developed on the surface of said membrane filter. This method surely collects bacteria on the surface of the membrane filter without causing them to die out and with this method operation such as incubation is easy.