how do parasites make us sick and are they already in ourer body

Question: how do parasites make us sick and are they already in ourer body
- Keywords:
  body,
  disease,
  microorganism,
  parasite
Asked by Jessica Watts1234 to Clare on 10 Nov 2014. This question was also asked by 534gdna37.
- Clare Harding answered on 10 Nov 2014:
  
  So if you live in the UK, you probably don’t have any parasites. They dont normally live in the UK and we have a lot of controls in our food to make sure we dont eat them.
  
  But if you live in a hot country, then you can get parasites is from insect bites (like malaria or leishmanisis), or from contaminated water (like schistosomiasis) or food (like tapeworm).
  
  The only parasite you might have in the UK is Toxoplasma, the one I work on and my favorite! It infects 1 in 3 people in the UK but your more likely to get it when your older. But this parasite doesn’t make us sick and you would never know you were infected. Your more likely to get it if you like undercooked meat (like rare steak) or if you have cats.

Question: how do parasites make us sick and are they already in ourer body