zidovudine antiviral activity 8 didanosine 8 human 8 nonhuman 8 unclassified drug 8 Antiviral activity 6 Herpes simplex virus 6 Human immunodeficiency virus 1 6 Humans 6 article 6 drug structure 6 stavudine 6 unindexed drug 6 Anti-HIV Agents 4 Dengue virus 4 HIV-1 4 Human immunodeficiency virus 1 infection 4 RNA directed DNA polymerase inhibitor 4 Seaweed 4 abacavir 4 aciclovir 4 anti human immunodeficiency virus agent 4 antivirus agent 4 controlled study 4 drug mechanism 4 drug synthesis 4 drug targeting 4 fucoidin 4 in vitro study 4