What happened on the Argentine cruise ship in which three people died from hantavirus is very sad and, of course, must be investigated. However, many news stories are being read in which it is used to bring to mind bitter pandemic memories and generate an unnecessary stir. The risk for the general population is extremely low, as many experts have been quick to assure.
However, it does show how dangerous it can be to let a pathogen circulate in a closed, moving place, like a boat. We can even go a step further now that the space race is in fashion: what would happen if something like this happened on a spaceship?
It couldn’t happen. Typically, hantavirus It is transmitted by rodentslike rats and mice. Generally, infection in humans occurs through inhalation of contaminated particles (usually dust) with their feces or urine. This means that, in most cases, the contagion is a zoonosis. The virus passes from an animal to a human. That in space would be impossible. Spaceships are monitored under a magnifying glass, it would be impossible for a mouse to enter without being seen.
It is true that there is a specific type of hantavirus, the Andes virus, in which cases have been documented due to human-to-human contact. However, according to has explained to Science Media Center the researcher at the MRC-University of Glasgow Viral Research Center Liam Brierley, contact must be very very close. Contact on spaceships, where a few people must spend a lot of time together in a very small space, would be very close. But don’t panic.
Sterility and quarantines. Each of the modules that make up the spacecraft are assembled in white roomsunder strict sterile conditions. Thus, microorganisms, pathogenic or not, are prevented from traveling into space attached to their surfaces. Regarding astronauts, they undergo all kinds of medical examinations to verify that they are not infected with any pathogen. Also, before traveling to space They must spend time in quarantine. This prevents the incubation of something that cannot be detected in medical examinations at the time of starting the journey.
It wasn’t always like this. In reality, quarantines began to be implemented after the astronauts of the Apollo 7, 8 and 9 missions had to deal with a cold in space. Although none of them became seriously ill, they did report that the symptoms were especially bothersome in this very different environment. Therefore, it was decided to take even more measures to prevent something like this from happening.
The Apollo 7 crew had to deal with a cold.
Not all microorganisms stay on land. It is impossible to strip a human being of all the microorganisms that live in his body. The microbiota is the set of microorganisms that are naturally found in our body. Many of them are beneficial for us, as they protect us from pathogens or help us carry out processes such as digestion. All these microorganisms always travel with us, so it is impossible to separate ourselves from them. And even if you could, it would be dangerous to do so.
Others that cannot be avoided. Nor can latent viruses be avoided, like shingles. Once a person passes the infection, these remain asleep in the organism. They may never come forward again or they may do so, usually at a time when the immune system is weakened. It has been seen that reactivations of this type of virus are quite common in space and the truth is that it is not rare, since it affects the immune system at many levels.
Three basic pillars. Microgravity, cosmic radiation and the stress of being in such an inhospitable place are the three main reasons why the immune system is affected by space travel.
Everything in its place. Microorganisms that are completely harmless in a person’s microbiota can be harmful to another individual, either because they are immunosuppressed or because their defenses are not well trained against that organism. enemy. It is something that, for example, happens with many microorganisms on the skin. It should also be taken into account that there are microorganisms that are harmless in some organs, but harmful in others. It occurs, for example, when bacteria from the digestive system pass into the urinary system. Be careful which direction you wipe when going to the bathroom.
We cannot get rid of our microbiota. And thank goodness.
Malted pathogens. We have already seen that it is very difficult for pathogenic microorganisms to travel to space. But it may be the case that an apparently innocuous microorganism appears where it should not. Or it may no longer be harmless due to spatial conditions.
It is known that cosmic radiation, extreme temperature conditions or microgravity can influence the genes expressed by a microorganism. For example, in pathogenic bacteria, such as Salmonella typhimuriumit has been observed that in space They express a genetic pattern very different from the one they use on Earth. Besides, they become more virulent when they are off the planet. We do not know if some apparently innocuous microorganisms could also develop certain virulence due to this change of environment.
An eye on the future. For something like this to happen today would be very strange. However, there are two scenarios in the future in which, perhaps, one of these situations could occur. On the one hand, microorganisms are deliberately introduced into the ships. For example, there could be microorganisms that transform lunar regolith into arable soil. It would be necessary to see if it is worth taking the risk of putting them on a spaceship. On the other hand, in the future space travel will be much more the order of the day. Then there may not be as many controls as there are now or, out of so many, some may fail.
Just as globalization has led some pathogens to travel faster around the world, it would not be unusual for something similar to happen in space. We’re speculating, but it’s worth thinking about it well in advance. At the end of the day, prevention will always be more worth it than cure. Especially if it is about avoiding a space epidemic. In any case, we insist, this is nothing more than speculation about what could happen: for now, do not panic.
Image | NASA/Magnific | NASA | Ethan Hillman et al.
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