Three communicable or infectious diseases that need to be immediately reported are Anthrax, Botulism and Poliomyelitis.
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The Columbian exchange was the arrival of new species in the Old and the New Worlds. Among the many species that arrived in the New World were the bacteria and viruses that were causing many illnesses but to which the Old World people were immune. The Native Americans were not immune so many of them, by some estimates even 90 %, died.
Answer:
The spacecraft went into a spin as a result of the inflatable airlock being ejected in preparation for re-entry. Their oxygen levels continued to climb to dangerous levels inside and a single spark could have caused a massive explosion and vaporized the entire spacecraft.
