NPC Pathogen?

Across the world, it's estimated 30–50% of people are infected with Toxoplasma — and infections may be increasing in Australia. A survey of studies conducted at blood banks and pregnancy clinics across the country in the 1970s put the infection rate at 30%. However, a recent Western Australian community-based study found 66% of people were infected.

https://www.livescience.com/toxoplasma-parasite-human-eyes