I have to say, this isn’t my area at all – so really, I don’t know!
But… I once saw a lecture about tapeworms which almost made me sick… the scientist giving the talk went into detail about his job visiting countries in Africa and literally sifting through people’s poo to find evidence of them having a tapeworm inside them! Thankfully, that’s not something I ever have to do as a physicist!!
I remember that in that case you had to eat something that has the parasite in it, like raw meat…
Parasites spread most rapidly when they have a big food source – and more often than not that food source is animals, or even humans! Parasites spread further when an animal eats meat containing parasites, or comes into contact with other animals who have the parasite. Some parasites have a very short life cycle, and can spread very rapidly.
I had to google this! But your question was ace as it got me learning too
Human parasites are organisms that live inside us, we are their hosts! Gross. Parasites are unable to produce food for themselves, so they depend on what we eat. Because they eat our food they can destroy our tissues and cells, and they produce toxic waste products that can make people very ill.
Our way of life can contribute to the spread of parasites. Kids can contract parasites from their nurseries and schools. Children and adults with dogs and cats at home are at risk for getting parasites. Also, those people that eat at restaurants are at a higher risk because food handlers have been known to spread parasites (if they don’t wash their hands!!!).
Human parasites are just about everywhere in our environment, so it is easy to become infected. The following is just some of the ways people can acquire parasites:
• insect bites
• animal poo
• walking barefoot
• handling raw meat and fish
• eating raw or undercooked pork, fish or chicken
• handling soiled litter pans (cats)
• eating contaminated raw fruits and vegetables
• eating meals prepared by infected food handlers
• drinking contaminated water
• having contact with infected persons (including sexual contact, kissing, and shaking hands)
• inhaling contaminated dust (parasitic eggs or cysts)
BUT as long as you wash your hands properly and dispose of dirty tissues etc then you should be fine, so don’t panic!