First molecular detection and genetic diversity of Hepatozoon sp. (Apicomplexa) and Brugia sp. (Nematoda) in a crocodile monitor in Nakhon Pathom, Thailand.

The crocodile monitor (Varanus salvator) is the most common monitor lizard in Thailand. Based on habitat and food, they have the potential to transmit zoonoses, with a high possibility of infecting ectoparasites and endoparasites. Diseases that could infect crocodile monitors and be transmitted to other animals, including humans. This research aims to identify and evaluate the phylogenetic relationships of Hepatozoon sp. and sheathed microfilaria in crocodile monitors. The phylogenetic analyses of Hepatozoon, based on 18S rRNA, and sheathed microfilaria, based on the COX1 gene, revealed that the Hepatozoon sp. were grouped with H. caimani, while sheathed microfilaria were grouped together with B. timori. This study provides insights into the genetic diversity and host-parasite interactions of hemoparasites in crocodile monitors in Thailand.