Extracts of seaweeds, seagrasses and mangroves from the southeast coast of India have been tested in vitro for antiviral activity against Newcastle disease, vaccinia, Semliki Forest, encephalomyocarditis and hepatitis B viruses. In the primary test, of 73 extracts examined, 43 exhibited antiviral activity (> 50%) against at least any one of the viruses. Only two extracts, leaf of Bruguiera cylindrica and bark of Rhizophora mucronata showed activity against all the viruses tested
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Premnathan et al. (1992) studied this question.
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