Neospora caninum (N. caninum)

Neospora caninum is an obligate intracellular protozoan parasite within the phylum Apicomplexa, closely related to Toxoplasma gondii (Source: Dubey et al., 2007, Clinical Microbiology Reviews). It is recognized globally as a leading cause of infectious abortion in cattle and causes significant neuromuscular disease in dogs, which serve as the definitive hosts (Source: Merck Veterinary Manual). The parasite's life cycle involves both horizontal transmission via the ingestion of oocysts and vertical transmission from mother to fetus, the latter being a primary driver of its persistence in cattle herds (Source: Reichel et al., 2013, International Journal for Parasitology). While it is not currently known to cause disease in humans, its economic impact on the livestock industry is substantial. Pharmacological intervention often targets the parasite's metabolic enzymes or organelles, such as the apicoplast, using drugs like ponazuril or sulfonamide-pyrimethamine combinations (Source: Lindsay and Dubey, 2020, Journal of Parasitology). These treatments are primarily effective against the tachyzoite stage rather than the dormant bradyzoite cysts, presenting a significant therapeutic challenge in achieving complete clearance.

Other names

N. caninumNeospora

Drugs targeting Neospora caninum typically act by inhibiting essential metabolic pathways such as folic acid synthesis via dihydrofolate reductase inhibition (pyrimethamine) and dihydropteroate synthase inhibition (sulfonamides), or by disrupting apicoplast function (triazines like ponazuril) (Source: PubChem; Lindsay and Dubey, 2020, Journal of Parasitology).