Sucking lice

The genus Polyplax belongs to the order Phthiraptera and the family Hoplopleuridae. These insects are obligate ectoparasites that specialize in feeding on the blood of rodents.

Adult lice are dorsoventrally flattened and possess specialized claws to grip hair shafts firmly. Their mouthparts are retracted and adapted for piercing host skin to feed on blood.

The life cycle consists of three stages: egg, nymph, and adult. All stages occur on the host, making the parasite highly dependent on the host's body temperature and environment.

Females cement eggs (nits) to the base of the hair. The life cycle is relatively rapid, allowing for explosive population growth if not controlled early in the infestation process.

Identification is best achieved through microscopic examination of the fur. Observing nits or moving adult lice confirms the presence of the parasite within the rodent colony.

The primary impact of Polyplax is chronic irritation caused by the louse's feeding activity. Constant biting induces severe pruritus (itching) in the host animals.

Self-mutilation by scratching often leads to dermatitis, open sores, and secondary skin infections. These lesions significantly deteriorate the welfare and health of the rodents.

These parasites act as vectors for various pathogens, potentially transmitting diseases throughout the colony. This risk is particularly high in dense populations or poorly managed environments.

Severe infestations cause anemia due to sustained blood loss. Weakened animals show reduced growth rates and become more susceptible to other opportunistic illnesses.

Physical appearance is marred by patchy fur loss, crusting, and matted hair. This reduction in health status is detrimental to breeding programs and laboratory research quality.

Effective control requires a multi-faceted approach, combining direct treatment of the animals with environmental sanitation. Eradicating the parasite from the cage habitat is essential.

Veterinary-approved insecticidal treatments, such as topically applied drops or specific powders, are used to eliminate active lice. Dosages must be strictly followed to avoid toxicity.

Thorough cleaning and disinfection of cages, bedding, and enrichment items are vital to kill eggs that may have fallen off the host. Without environmental control, re-infestation is likely.

Implementing a strict quarantine procedure for new arrivals prevents the introduction of Polyplax into existing healthy colonies. Regular screening is a best practice for animal welfare.

• Systematic visual inspections.
• Isolation of infected individuals.
• Use of professional-grade pediculicides.
• Strict cage hygiene protocols.
• Quarantine for all new additions.