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<p>Reptiles often inhabit environments that are in close proximity to humans and livestock, creating opportunities for parasite transmission. They are common in areas where they find shelter, food and warmth. The Bengal monitor lizard (<i>Varanus bengalensis</i>), a member of the family Varanidae, represents one of the largest groups of extant poikilothermic predators. Monitor lizards are known to harbor several tick species that serve as vectors for a variety of pathogens. No prior information is available in the literature regarding ticks infesting <i>V. bengalensis</i> in Pakistan as well as regarding the occurrence of <i>Toxoplasma gondii</i> in these ticks. Therefore, we aimed to determine the molecular prevalence of <i>T. gondii</i> in <i>Amblyomma gervaisi</i> ticks (<i>n</i> = 93) collected from 24 <i>V. bengalensis</i> in Buner District, Khyber Pakhtunkhwa Province, Pakistan, between May and September 2023. Polymerase chain reaction (PCR) amplified a 300&#xa0;bp fragment specific for the <i>ITS-1</i> region of <i>T. gondii</i> in 10 of the 93 (11%) <i>A. gervaisi</i> ticks. DNA sequencing and BLAST analysis confirmed the presence of <i>T. gondii</i>. Phylogenetic analysis showed that these sequences clustered with the <i>ITS-1</i> sequences of <i>T. gondii</i> detected in reptiles and mammals from Pakistan, Brazil, China, Tunisia and Portugal. The prevalence of <i>T. gondii</i> in <i>A. gervaisi</i> was not limited to a specific tick sex, feeding stage or month of sampling. However, among the tick developmental stages, nymphs had the highest rate of <i>T. gondii</i> infection. In conclusion, for the very first time from Pakistan, we are reporting the presence of <i>T. gondii</i> in <i>A. gervaisi</i> that were infesting monitor lizards. We recommend that similar and large scale studies should be conducted in all those areas of Pakistan that are unexplored for the presence of <i>T. gondii</i> in <i>A. gervaisi</i> ticks. Prevalence of this parasite should also be screened in all the animals harboring these as well as other tick species. This will help in better understanding of <i>T. gondii</i> transmission to new hosts that will lead toward its effective control.</p>

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Molecular detection of Toxoplasma gondii in Amblyomma gervaisi ticks infesting monitor lizards (Varanus bengalensis)

  • 期刊论文

  • 发表日期：

    2026年5月2日

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  • Muhammad Naeem,
  • Muhammad Ammar Ameen,
  • Hafiza Misbah Munir,
  • Huma Fatima,
  • Shakir Ullah,
  • Hira Muqaddas,
  • Kasim Sakran Abass,
  • Adil Khan,
  • Furhan Iqbal

摘要

Reptiles often inhabit environments that are in close proximity to humans and livestock, creating opportunities for parasite transmission. They are common in areas where they find shelter, food and warmth. The Bengal monitor lizard (Varanus bengalensis), a member of the family Varanidae, represents one of the largest groups of extant poikilothermic predators. Monitor lizards are known to harbor several tick species that serve as vectors for a variety of pathogens. No prior information is available in the literature regarding ticks infesting V. bengalensis in Pakistan as well as regarding the occurrence of Toxoplasma gondii in these ticks. Therefore, we aimed to determine the molecular prevalence of T. gondii in Amblyomma gervaisi ticks (n = 93) collected from 24 V. bengalensis in Buner District, Khyber Pakhtunkhwa Province, Pakistan, between May and September 2023. Polymerase chain reaction (PCR) amplified a 300 bp fragment specific for the ITS-1 region of T. gondii in 10 of the 93 (11%) A. gervaisi ticks. DNA sequencing and BLAST analysis confirmed the presence of T. gondii. Phylogenetic analysis showed that these sequences clustered with the ITS-1 sequences of T. gondii detected in reptiles and mammals from Pakistan, Brazil, China, Tunisia and Portugal. The prevalence of T. gondii in A. gervaisi was not limited to a specific tick sex, feeding stage or month of sampling. However, among the tick developmental stages, nymphs had the highest rate of T. gondii infection. In conclusion, for the very first time from Pakistan, we are reporting the presence of T. gondii in A. gervaisi that were infesting monitor lizards. We recommend that similar and large scale studies should be conducted in all those areas of Pakistan that are unexplored for the presence of T. gondii in A. gervaisi ticks. Prevalence of this parasite should also be screened in all the animals harboring these as well as other tick species. This will help in better understanding of T. gondii transmission to new hosts that will lead toward its effective control.