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Biological laboratories are scientific institutions dedicated to experimenting and researching pathogenic microorganisms.

These institutions focus on studying pathogens, developing treatments and drugs, and providing protection for the safety of human lives. GfuM2t

Biological laboratories are divided into four biosafety levels based on the degree of biological risk of the research objects. Level one laboratories have the lowest requirements for biological safety isolation, while level four has the highest.

Level one laboratories work with pathogens that pose almost no harm to healthy adults, such as chickenpox. Personnel working in level one labs only need to wear gloves and facial protective equipment. Some workstations are open, and some labs may not even be isolated from the public.

Level two laboratories work with pathogens that only cause mild illnesses in humans. They typically have preventive and treatment methods, such as measles. Level two labs are isolated from the public, and only authorized personnel can enter.

Level three laboratories deal with pathogens that can cause severe or fatal diseases in humans and can spread through droplets. These diseases may have preventive and treatment methods, but constant vigilance is required. For example, rabies, HIV/AIDS, and SARS coronavirus, an atypical pneumonia, which once ravaged the world and still make people frightened when mentioned, fall under level three. KaoAN

Personnel conducting research and working in level three labs, even if experienced, must undergo specialized training for the pathogens beforehand. The lab must be completely sealed and under negative pressure to prevent gas leakage.

During experiments, rigorous protective measures must be taken. Personnel must wear protective clothing in the anteroom before entering the lab, and all experiments must be conducted within biological safety cabinets.

Level three labs already have such strict safety precautions.

Level three labs already handle pathogens at the level of HIV/AIDS and SARS. UD8njk

Then, what about level four labs?

Level four labs are laboratories with the highest biosafety level globally.

They handle pathogens that are little known to humans, extremely deadly, airborne, and have no preventive methods. Once infected, there is no cure for the pathogens. freёnovelkiss.com

That’s why people also call level four labs “Devil’s Lab.” 4r0svY

Level four labs need to be completely isolated from nearby buildings. They require special air conditioning systems with a filtration efficiency of 99.999%.