evidence: The Biden administration declared monkeypox a public health emergency on Thursday as cases topped 6,600 nationwide. [...] "We’re prepared to take our response to the next level in addressing this virus and we urge every American to take monkeypox seriously and to take responsibility to help us tackle this virus," Department of Health and Human Services Secretary Xavier Becerra said in a Thursday briefing about the emergency declaration. [...] The World Health Organization declared monkeypox a public health emergency of international concern last month, a designation reserved for the most serious global disease outbreaks. It has previously been used for Covid-19, Zika, H1N1 flu, polio and Ebola. At least 26,200 monkeypox cases have been confirmed worldwide this year, according to the Centers for Disease Control and Prevention.