by Leah Chandler. Disease Etiology: Malaria is a protozoan disease, which are a group of eukaryotic single-celled organisms that infect humans and inhabit the body as parasites. Malaria is caused by four species of the protozoan genus Plasmodium, P falciparum, P vivax, P malariae, and P ovale.
The average NFL referee salary was $173,000 in 2013, and it is set to rise to $201,000 by 2019. Note that the NFL season only lasts about half the year, and for most NFL referees, refereeing is not their only job.
NFL referees are not full-time officials, and are restricted to making less than 50% of their annual earnings from refereeing NFL games. However, many of the NFL referees are professionals making much more than $100,000 per year from their day jobs, so they are very well paid part-time officials. On the other hand, MLS soccer referees make only $500 to $800 per game, for maybe 24 games per year, and Assistant Referees make a lot less.