Table 2.

The results of microbiological tests for GF status.

Microorganism	before gross morphological experiments	before behavioral experiments	after behavioral experiments
Mouse hepatitis virus	0/18	0/35	0/35
Sendai virus	0/18	0/35	0/35
Ectromelia virus	0/18	0/35	0/35
Lymphocytic choriomeningitis virus	0/18	0/35	0/35
Mouse rotavirus	0/18	0/35	0/35
Mouse parvovirus	0/18	0/35	0/35
Mouse encephalomyelitis virus	0/18	0/35	0/35
Pneumonia virus of mice	0/18	0/35	0/35
Mouse adenovirus, reovirus type 3	0/18	0/35	0/35
Lactate dehydrogenase elevating virus	0/18	0/35	0/35
Mycoplasma pulmonis	0/18	0/35	0/35
Salmonella typhimurium	0/18	0/35	0/35
Clostridium piliforme	0/18	0/35	0/35
Pasteurella pneumotropica	0/18	0/35	0/35
Cilia-associated respiratory bacillus	0/18	0/35	0/35
Escherichia coli O115a	0/18	0/35	0/35
Helicobacter hepaticus	0/18	0/35	0/35
Pseudomonas aeruginosa	0/18	0/35	0/35
Pneumocystis carinii	0/18	0/35	0/35
Syphacia obvelata	0/18	0/35	0/35
Aspiculuris tetraptera	0/18	0/35	0/35