The in vitro antiviral activity demonstrated by aqueous extract (AE) of Achyrocline flaccida on herpes simplex virus type-1 is exerted early during the viral replication, essentially during the viral adsorption to host cells. A bioguided purification process of the AE indicated that negatively charged polysaccharides were responsible for this antiviral activity.
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Garcia et al. (1999) studied this question.