Technology has improved dramatically
Technology for detecting parasites and other pathogens has improved dramatically since 2013. This PCR (polymerase chain reaction) test looks for the genetic fingerprint of a wide range of pathogens. This is a far more sensitive test than the old fashioned technique of looking through a microscope.
There are many possibilities of where these parasites may come from including:
- contaminated waterways or swimming pools
- eating uncooked or unwashed contaminated fruit and vegetables
- bathroom fixtures
- nappy changing tables
- sexual contact
The use of drugs to lower stomach acid is also believed to increase the risk of a gut parasite.