<P> As of 2016, no approved human vaccine exists against Toxoplasma gondii . Research on human vaccines is ongoing . </P> <P> For sheep, an approved live vaccine sold as Toxovax (MSD Animal Health) provides lifetime protection . </P> <P> The genomes of more than 60 strains of T. gondii have been sequenced . Most are 60 - 80 Mb in size and consist of 11 - 14 chromosomes . The major strains encode 7800 - 10,000 proteins, of which about 5200 are conserved across RH, GT1, ME49, VEG . A database, ToxoDB, has been established to document genomic information on Toxoplasma . </P> <P> In 1908, while working at the Pasteur Institute in Tunis, Charles Nicolle and Louis Manceaux discovered a protozoan organism in the tissues of a hamster - like rodent known as the gundi, Ctenodactylus gundi . Although Nicolle and Manceaux initially believed the organism to be a member of the genus Leishmania that they described as "Leishmania gondii", they soon realized they had discovered a new organism entirely; they re-named it Toxoplasma gondii . The new genus name Toxoplasma is a reference to its morphology: Toxo, from Greek τόξον (toxon, "arc, bow"), and πλάσμα (plasma, "shape, form") and the host in which it was discovered, the gundi (gondii). The same year Nicolle and Mancaeux discovered T. gondii, Alfonso Splendore identified the same organism in a rabbit in Brazil . However, he did not give it a name . </P>

Where are the organisms that cause toxoplasmosis most likely to be found