There are lots of ways diseases can spread. The main ways infections are spread is through direct contact – this can be person-to-person (e.g. touching, kissing or through a blood transfusion), animal-to-person (e.g. from your pets, or being bitten by a posquito) or mother-to-baby (through the placenta). Transmission by indirect contact is caused by microbes that have been left on a contaminated surface, such as a door handle, and then been touched and picked up by someone else – if then touch your face (particularly your mouth and nose) before washing your hands, then you’re quite likely to get the disease. Indirect contamination can also include eating infected food, such as chicken or pork that hasn’t been cooked properly to kill of the bad bugs, or fruit and veg that haven’t been washed.