Filarial Infections in Chameleons: Ecological Patterns and Case Reports

Filarial nematodes are vector‑borne parasitic worms transmitted by biting insects such as mosquitoes. In reptiles, including chameleons, they can inhabit subcutaneous tissues or body cavities, sometimes visible as worm-like swellings under the skin. Their impact ranges from mild irritation to severe pathology depending on parasite load, host condition and season.

Chameleons are particularly vulnerable in environments where vector insects are abundant. Field observations indicate that filarial infections are common in Malagasy chameleons, especially in lowland warm habitats, but rare in African montane species.

Prevalence in Malagasy Chameleons

Species frequently reported with filarial infections include:

• Furcifer pardalis (Panther chameleon)

• Furcifer verrucosus (Warty chameleon)

• Furcifer oustaleti (Oustalet's chameleon)

• Furcifer viridis (Green chameleon)

These taxa inhabit lowland warm environments, where vector insects thrive. The ecological correlation between warm climates and parasite prevalence is consistent with broader reptile parasitology observations.

Rarity in African Chameleons

In contrast, African chameleons—particularly montane species from moist, cool environments—rarely exhibit filarial infections. In Madagascar, highland species also show less filarial infections.

A Rare Case: Kinyongia multituberculata

An exceptional case was documented in Arusha, West Usambara Mountains, involving Kinyongia multituberculata, the West Usambara Blade‑Horned Chameleon. This montane species typically inhabits cooler, moist forests where filarial infections are unusual. The specimen showed clear signs of infestation, making it a rare example of filarial presence in highland chameleons.

Photo and find of K. multituberculata credited to Frank Shirima.