This is something I've been pondering about for a while, especially since the coronavirus lockdown. So like, after a civilization is struck with a deadly plague, they become immune to said plague until a stronger strain is spread. So if I were to go back to another world (isekai'ed), wouldn't I bring said diseases with me? --Exhibit A: https://www.travelandleisure.com/trip-ideas/green-travel/worlds-most-secluded-island-north-sentinel "But, according to one tribal rights group, the Sentinelese are in danger of dying out. Survival International has named the tribe the most vulnerable group of people in the world, as they have not built up immunity to common diseases like the flu." --Exhibit B: https://en.wikipedia.org/wiki/Native_American_disease_and_epidemics "The arrival of Europeans also brought on the Columbian exchange. During this period European settlers brought many different technologies and lifestyles with them. Arguably, the most harmful effect of this exchange was the arrival and spread of disease. Numerous diseases were brought to The Americas, including smallpox, bubonic plague, chickenpox, cholera, the common cold, diphtheria, influenza, malaria, measles, scarlet fever, sexually transmitted diseases, typhoid, typhus, tuberculosis, and pertussis." Now, I'm not a scientist, so I don't know whether or not one person is enough to contaminate an entire civilization, but what if they actually came in groups? Like you know, Grimgar or Arifureta or Deathmarch. If so, the heroes they summoned to save their world are actually the ones who doom it.
Yes, if you get isekaid, and god doesn't cleanse your body or give you a new body (like deathmarch), forget corona, you are a walking plague. We carry with us many diseases like chicken pox and etc. A person being isekaid without being reincarnated or cleansed is like a walking bomb.
But it could also happen the opposite, the hero being killed by some random disease from another world....... though our flu could also affect them.......
Not all. Many do not. Though the summoning ritual can also maybe cleanse. Overall, I don't think much isekai stories put much thought into it. Also, in some sense that also works the other way around, if you are not given immunity to the stuff their world has, you can get sick pretty fast. Albeit our immune system should be stronger in general due to more exposure to infections.
To be fair, in a world where people are mana enhanced, so would bacteria and viral strains be. They're more likely to get mana flu than give others in a world where there's 'cure' and 'heal status' our simple strains.
One person is absolutely enough to carry a disease. Once it starts spreading then it will grow exponentially, just as with coronavirus. The reason larger groups are riskier is quite simply because it is likelier for there to be a carrier of a specific pathogen, and a larger transmission vector that must be isolated and quarantined. And it's not "immune...until a stronger strain is spread." It is immune until the pathogen mutates into a strain we are not already immunized against.
It is very possible especially if the forces of good have grown too powerful and the balance of the that world was broken.
It most likely is. I don't remember his name, but there was an European explorer who traveled the inland of South America. Not a lot of people did at the time, due to the terrain and stuff. He is at the very least the only person who wrote about the presence of cities in that part of the world. For the longest time, though, no one believed that he wrote the truth. Because there weren't any cities in the Amazon, and the soil was thought to be too poor to sustain large populations. Only recently did people discover the overgrown ruins and the fields of terra preta. They just vanished in the 50 years between that mans visit to the cities, and the explorers of later generations who came to explore what he described. Their entire cities and science, lost. Advanced civilizations - our modern science still can't figure out how they made that terra preta that sustained their cultures.
Thus meaning the pathogen would spread, no? Yeah it would be an awesome plotline where the consequences of gods interfering in the lives of their subjects may have some dire consequences. Kinda like the Second Coming of Gluttony where the sub gods can't interfere otherwise it would cause a ripple and give the main god a justification to do something against them.