An extensive survey for Chlorella viruses was done across Japan
and in nine countries of Asia, Europe, North America, and South
America. Of 150 fresh-water samples collected from 77 distinct
areas in Japan, 29 showed plaques on a lawn of Chlorella sp.
(strain NC64A). Typically, 10 to 1000 PFU/ml of viruses were
present at sampling sites located throughout Japan. Viruses were
also detected in two samples from Brazil and China but not from
other countries where water samples were screened. Physiological
and ecological factors affecting virus distribution are
discussed. Widespread distribution of Chlorella viruses in
Japan. Yamada-T; Shimomae-A; Furukawa-S; Takehara-J. Biosci-
Biotechnol-Biochem. 1993 May; 57(5): 733-9. Yamada-T. etal:
Widespread distribution of Chlorella viruses in Japan. Biosci-
Biotechnol-Biochem. 1993 May; 57(5): 733-9. Immune Response
(Broilers) Only increased the live weight of experimental
broilers at the end of the second week of life. Enhanced the
phagocytic activity and lymphatic tissue