Mixed respiratory viral infections during influenza A epidemics.

Mixed respiratory viral infections occurring in the course of 8 influenza A epidemics in the Estonian SSR between 1969 and 1978 were investigated. A total of 1638 patients were followed up. The IF method, serological test CFR and HIR and isolation of the virus on tissue cultures and chick embryos were used.

[Lymphotoxin production by human lymphocytes. III. The action of adenovirus antigen].

In lymphocyte cultures (LC) from 5 immune donors blast transformation occurred as a result of the stimulting action of adenovirus antigen; the supernatants obtained from these cultures produced a cytotoxic effect on L cells, thus suggesting the presence of lymphotoxin (LT). No blast transformation and no LT production were detected in nonstimulated LC used for control, as well as in LC from 9 nonimmune donors. LT production was shown to depend on the time elapsed after recovery from acute adenovirus infection.

[Production of lymphotoxin by human lymphocytes. II. Stimulation by purified tuberculin].

A total of 43 lymphocyte culture (LC) from 12 adults (aged 32--48 years) and 21 children 6--7 years of age were studied. In PPD-stimulated adults LC stimulation ratio ranged from 8 to 39%; their cytotoxic activity, i.e.