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.
In the second round of the playoffs and for the All-Star Game, referees earn $1,200 per game, while assistant referees earn $525 and fourth officials earn $450. During the MLS Cup, referees earn $1,500, assistant referees earn $750 and fourth officials get $600.