1. Manual for the identification of medical bacteria;Cowan, S.T.; Steel, K.G.,1974
2. A plate test for nitrate reduction;Cook, G.T.;J Clin Pathol
3. Factors influencing the reduction of nitrates and nitrites by bacteria in semi-solid media;Zobell, C.E.;J Bacteriol
4. Human parvovirus specific IgM in antigen positive serum In 1984 a programme of virological studies on infection with the newly described human parvovirus,' now designated B19 virus,2was started in Florence. We report here our first observations
5. Stored sera, collected from May to July 1983 for other epidemiological purposes from 221 healthy soldiers assigned to five different units were screened for immunoelectro-osmophoresis reactivity to B19 antibodies. Polyethylene glycol 6000 was added to the gel to increase the sensitivity of the test. The antigen was detected in two subjects stationed in different units. Serum samples of both subjects had low immunoelectro-osmophoresis reactivity. The serum of one subject with mild respiratory syndrome some days before the sampling (incomplete information), was weakly positive for B19 DHA by molecular hybridisation,3 and viral particles of the B19 size and morphology were seen by electron microscopy. Although specific antibodies had not been added, virions and empty particles appeared as aggregates, and cross linking Ig was visible. Precipitating antibodies to B19