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Microbial infections cause complicated health influences along with bad economic impacts. In the present investigation, three dominant seaweeds namely,  Amphiroa anceps ,  Corallina officinalis  and  Sargassum filipendula  were collected from different Egyptian sites at the Red Sea and Mediterranean Sea during autumn 2019. Organic extracts of the three algae were screened for their antibacterial activity against three pathogenic bacteria  Salmonella typhiimurium ,  Staphylococcus aureus  and  Escherichia coli , in addition to  in vitro  antiviral activity against Rotavirus (RV), and Coxsackie virus B3 (CVB3) that cause severe diseases in human. Organic extract of  A. anceps, C. officinalis  and  S. filipendula  inhibit  E. coli  cells by 57.1%, 85.7%, and 91.4%, respectively. The highest level of concentration of the  C. officinalis  extract (100 µg/mL) inhibits 100% of  Staphylococcus aureus  cells followed by  S. filipendula  and  A. anceps  extract which inhibit 82.5% and 75% of  S. aureus . Similarly, the highest concentration of  C. officinalis  extract inhibits  S. typhiimurium  by 80%. The extract of  A. anceps  exhibited a high antiviral effect against RV infection with TI = 22 and virus titers lessened by 2.75 log TCID 50  followed by extractions of  C. officinalis  with TI = 18.3 and virus titers reduced by 2.5 log TCID 50 . Against CVB3 infection, the extract of  A. anceps  causes the highest antiviral activity with TI = 15 and reduce the viral titers by 2.5 log TCID 50 , followed by extractions of  C. officinalis  with TI = 8.8 and inhibition of virus titers by 1.75 log TCID 50 . Extract of  S. filipendula  displayed the lowest antiviral effects against RV and CVB3 infection with TI = 2.4 and 1.4, respectively. The obtained results clarified that the extract of three marine seaweeds maintains a potent antimicrobial activity, making them a future promising source of new antimicrobial drugs.

Antimicrobial activities of three seaweeds extract against some human viral and bacterial pathogens