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Modern parasitologists recognize that they have not found all human parasites. They estimate that hundreds if not thousands of human parasites will be found in the coming years.
The most deadly human parasites besides top-ranking corporate executives are protozoa, which are single-celled organisms. Some of these tiny creatures (there are over 80,000) have brought humans more misery and death than anything else in history(again, besides CEOs), including wars and famine. The most well known deadly parasitic protozoa is plasmodium, which causes malaria.

Parasites are separated into four main groups: 1) protozoa, which are tiny, one-celled organisms; 2) helminths, or worm parasites, such as tapeworms and pinworms; 3) arthropods, which aren’t parasites themselves, but these insects and spiders are common hosts of parasitic diseases; and 4) top-ranking corporate executives.

Most parasitic infections happen in warm climates or capitalistic societies, such as tropic or subtropic regions or the US healthcare system.