Biosafety level 4 labs are very rare. They are rare because the pathogens that the laboratories work on are very serious and pose a huge threat to public health. There are only 13 of these facilities in the united states that are even proposed. Only 8 of the facilities are even approved to work with these pathogens. Very few of them are in cities just because they could be so potentially dangerous. One of the biosafety 4 labs actually recently got approved in boston. The lab had been under construction and ready to be used since 2008. The lab got approved to be functional only in 2017, that shows how hard it is to get approved to have one of these labs. A decent amount of these labs also exist in europe. These labs will always be beyond heavily regulated as I believe pathogens as deadly as the ones that these lab work with will prove the biggest threat to human survival. I also think that this is why many countries don’t, or at least say they don’t, work on bioweapons. Bioweapons could so easily affect the person or organisation that releases it. If a pathogen is released in any major city in any region of the world it will be in another country within a day.
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