Despite Pakistan's rich reptilian diversity, wild lizards have largely been unexplored for vector-borne parasites. This study reports the prevalence and phylogenetic assessment of Hepatozoon ophisauri and Toxoplasma gondii DNA in the blood samples of 101 wild lizards from Khyber Pakhtunkhwa, Pakistan, captured at altitudes of 1200 to 2250 m above sea level between March 2022 and June 2023. PCR-based molecular analysis identified H. ophisauri DNA in three (3%) lizards of all Laudakia tuberculata. Additionally, 45 (44.5%) lizards tested positive for T. gondii DNA, including L. agrorensis, L. pakistanica, L. tuberculata, and Abblepharus pannonicus. Sequence analysis and BLAST confirmed the presence of H. ophisauri and T. gondii. Phylogenetic analysis showed genetic diversity among the H. ophisauri and T. gondii nucleotide sequences, clustering with reference sequences from reptiles, birds, and ticks. Toxoplasma gondii prevalence varied among species, with the highest rates in L. agrorensis and A. pannonicus (67%), followed by L. pakistanica (45%) and L. tuberculata (43%). This study is the first from Pakistan to report high T. gondii prevalence and low H. ophisauri prevalence in wild lizards. Similar and larger-scale studies in unexplored regions of Pakistan are needed to enhance understanding of these pathogens' genetic diversity and host-parasite interactions.

• Keywords
• Apicomplexa parasites, PCR, Pakistan, Phylogenetic analysis, Wild lizards,
• Publication type
• Journal Article MeSH

BACKGROUND: Blood parasites of the genus Karyolysus Labbé, 1894 (Apicomplexa: Adeleida: Karyolysidae) represent the protozoan haemogregarines found in various genera of lizards, including Lacerta, Podarcis, Darevskia (Lacertidae) and Mabouia (Scincidae). The vectors of parasites are gamasid mites from the genus Ophionyssus. METHODS: A total of 557 individuals of lacertid lizards were captured in four different localities in Europe (Hungary, Poland, Romania and Slovakia) and blood was collected. Samples were examined using both microscopic and molecular methods, and phylogenetic relationships of all isolates of Karyolysus sp. were assessed for the first time. Karyolysus sp. 18S rRNA isolates were evaluated using Bayesian and Maximum Likelihood analyses. RESULTS: A total of 520 blood smears were examined microscopically and unicellular protozoan parasites were found in 116 samples (22.3% prevalence). The presence of two Karyolysus species, K. latus and K. lacazei was identified. In total, of 210 samples tested by polymerase chain reaction (PCR), the presence of parasites was observed in 64 individuals (prevalence 30.5%). Results of phylogenetic analyses revealed the existence of four haplotypes, all part of the same lineage, with other parasites identified as belonging to the genus Hepatozoon. CONCLUSIONS: Classification of these parasites using current taxonomy is complex - they were identified in both mites and ticks that typically are considered to host Karyolysus and Hepatozoon respectively. Furthermore although distortions to the intermediate host erythrocyte nuclei were observed, the defining characteristic of Karyolysus, the haplotypes were nearly identical to those reported from lizards in the Iberian Peninsula, where such distortions were not reported and which were thus identified as Hepatozoon. Based on the phylogenetic analyses, neither vertebrate host, nor geographical patterns of the studied blood parasites could be established.

• MeSH
• Coccidia cytology   genetics   isolation & purification   MeSH
• DNA, Helminth chemistry   genetics   MeSH
• Phylogeny MeSH
• Lizards parasitology   MeSH
• Blood parasitology   MeSH
• Microscopy MeSH
• Molecular Sequence Data MeSH
• DNA, Protozoan chemistry   genetics   MeSH
• DNA, Ribosomal chemistry   genetics   MeSH
• RNA, Ribosomal, 18S genetics   MeSH
• Sequence Analysis, DNA MeSH
• Cluster Analysis MeSH
• Animals MeSH
• Check Tag
• Animals MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Geographicals
• Europe MeSH
• Names of Substances
• DNA, Helminth MeSH
• DNA, Protozoan MeSH
• DNA, Ribosomal MeSH
• RNA, Ribosomal, 18S MeSH