Neohaematopinus

Neohaematopinus is a genus of sucking lice (order Psocodea, family Polyplacidae) that are obligate ectoparasites. These insects have a specialized mouth apparatus adapted for piercing the skin and feeding on the host's blood.

Adults have a flattened, wingless body, typical of the suborder Anoplura. The size of the insects varies depending on the species, but it usually ranges from 1 to 3 millimeters, making them difficult to detect during a cursory inspection.

The head of Neohaematopinus is narrower than the thorax and features a pair of short, multi-segmented antennae. The legs are equipped with gripping claws that allow the insect to firmly attach to the host's hair coat.

The coloration of the parasite's body usually varies from light yellow to dark brown. Depending on how much blood is in the stomach, the appearance of the abdomen may change significantly, becoming rounder and darker.

The insect's development follows the type of incomplete metamorphosis, including the egg (nit), three larval stages, and adult (imago). The entire life cycle takes place directly on the body of the host animal.

The main hosts of Neohaematopinus are members of the order Rodentia, particularly squirrels and other small mammals. In conditions of commercial rodent breeding, the parasite can cause significant economic losses.

The damage manifests as constant irritation of the animal's skin caused by parasite bites. This leads to restlessness, disruption of feeding processes, and a decrease in the general productivity of the raised individuals.

Mass reproduction of lice on an animal's body causes anemia due to constant blood loss. Young individuals are particularly sensitive to infestation, which can lead to stunted growth and even death if treatment is not provided.

Skin lesions provoke the development of secondary dermatitis and allergic reactions. Animals begin to scratch actively, damaging skin areas to the point of bleeding, which creates an entry point for bacterial and fungal infections.

In addition to direct harm, some species of the genus are potential vectors of transmissible diseases. By damaging the integrity of the epidermis, Neohaematopinus facilitates the transmission of pathogens between individuals within a population.

The first sign of infestation is atypical animal behavior: constant restlessness, itching, and attempts to scratch against feeders or cage walls. Upon detailed inspection of the hair coat, one can notice the insects themselves or their eggs.

Nits are firmly attached to the base of the hair; unlike dandruff, they cannot be shaken off with a simple movement. They are most often located in the neck area, behind the ears, and along the spine, where the fur is denser.

The presence of red spots, scratches, and patches of hair loss (alopecia) indicates an advanced stage of infestation. When examining scratches, one may notice dried crusts of exudate.

The coat of infected animals often looks unkempt, matted, and dull due to the disruption of normal sebaceous gland function and constant scratching. In some cases, redness of the skin is observed.

If Neohaematopinus infestation is suspected, it is recommended to use a fine-toothed comb to brush parasites onto a white sheet of paper, which facilitates their visualization.

Control of Neohaematopinus must be comprehensive and include both the treatment of the animals themselves and thorough disinsection of the premises. Simultaneous treatment of all individuals in contact with each other is required.

To kill the lice, insecticidal preparations in the form of sprays, powders, or spot-on drops approved for specific animal species are used. It is important to strictly follow the dosage specified in the instructions.

Since the preparations often act only on the imago, a second treatment after 7–14 days is mandatory. This is necessary to destroy larvae that have hatched from eggs that survived the first procedure.

Disinsection of cages and equipment is carried out using disinfectant solutions. It is important to clean surfaces of bedding and organic residues, as parasite eggs can persist in them.

Prevention includes adhering to sanitary standards, quarantining new individuals, and regular visual inspection of the stock. Maintaining cleanliness in housing areas significantly reduces the risk of re-infestation.