vaccines or measles can be worked on. lab coats and gloves are worn and it s performed under a hood. eye protection and face shields are optional. some critics have likened bsl 2 conditions to a dental office. there are many more laboratory accidents or laboratory acquired infections bsl 2 compared to bsl 3. while there is no international bsl standard, he says bsl 2 as far too risky. we do all of the research in our lab on bat related coronaviruses under biological safety three enhanced conditions. we wear portable air breathing apparatuses with suits so workers are protected from anything that might be in the laboratory. now, the wuhan institute of virology is best known for its world class bsl 4 lab which became fully operational in 2018.