Most hospitals and microbiology teaching laboratories maintain __________ standards.ANSWERBSL-1BSL-4BSL-3BSL-2

Most hospitals and microbiology teaching laboratories maintain BSL-2 standards. This is because BSL-2 is suitable for work involving agents of moderate potential hazard to personnel and the environment. It includes various bacteria and viruses that cause only mild disease to humans, or are difficult to contract via aerosol in a lab setting. Examples of BSL-2 organisms include Staphylococcus aureus, Hepatitis A, B, and C viruses, and the Lyme disease bacterium. BSL-1 is for agents not known to cause disease in healthy adults. BSL-3 is for agents that can cause serious and potentially lethal diseases via the inhalation route. BSL-4 is for agents that pose a high risk of life-threatening disease for which no vaccine or therapy is available.