virus4d linkOur Link Checker is a free URL Checker and Website Checker tool desned to help users verify whether a website or link is safe. By integrating Google Safe Browsing, VirusTotal and otherDuring 2011–2025, GII.4 viruses have caused >50% of US outbreaks each season (defined as September 1 of one year through August 31 of the next) . Laboratory surveillance