How Common Are Mites on Humans?

Mites belong to the class of tiny animals of the order Arthropoda arachnids and broad-bellied subclasses. The body size is generally about 0.5 mm, some as small as 0.1 mm, and most species are less than 1 mm. Mites and spiders belong to the arachnid class. Adults have four pairs of feet, a pair of tentacles, no wings and antennae, and their body structure is different from insects. The worm body is divided into a jaw body and a body, the jaw body is composed of a mouth part and a jaw base, and the body is divided into a foot body and a terminal body. There are a lot of hairs on the body and feet, and some of them are very long. There are mouthparts at the front end, which have various food habits, such as dandruff. More than 50,000 mites have been found in the world, second only to insects. Many types are related to medicine. It has been found that mites are closely related to human health, such as leather mites, chigger mites, chigger mites, worm mites, powder mites, dust mites, and mite mites, which can bite people to suck blood and damage the skin, causing "rosacea" or Demodex , Allergies, urinary mites, pulmonary mites, intestinal mites, and scabies, which seriously endanger human health. ^[1]

Chigger adults are nearly round or oval in shape with raised dorsal surface and milky white or light yellow. Female mites are 0.3-0.5 × 0.25-0.4mm; male mites are 0.2-0.3 × 0.15-0.2mm.

There are two main types of mites that parasitize the human body. One is

1. Parasite

The life history of chigger mites is divided into five stages: eggs, larvae, pre-nymphs, post-nymphs and adults. Chigger mite

The most common mites are ear mites, chigger mites and demodex. Ear mites are a kind of mites that are parasitic in the ear canal. They often cause local itching, shaking ears, and brown secretions in the ear canal. The mite and antipruritic agent can be cured after 1 to 2 weeks. Chigger mites

Small skin lesions on chigger mites

Mite treatment

Mites are tiny arachnids (0.05-0.15mm in length, barely visible to the naked eye) and can crawl on fungi if given the opportunity. The most common way for mites to enter mycological laboratories is through hair, skin, nail samples, or by receiving other laboratory cultures contaminated with mites. As mites can crawl between different cultures, the bacteria and fungi they carry can contaminate the culture. This tiny microorganism can cause serious consequences. The best mite prevention and control system is to prevent it from entering the laboratory in the first place. If there is a risk of mite contamination, culture plates and tubes should be sealed with parafilm or shrink seals. If mites are detected and spread, it is recommended that all cultures that are not required to be preserved be autoclaved and discarded, and the laboratory be thoroughly cleaned with an effective disinfectant. If an attempt is made to retain a culture that cannot be discarded, it can be transfected on slanted medium containing 0.1% hexachlorobenzene, or the mite-producing fungus can be exposed to naphthalene crystals (camphor). The culture is exposed to a plastic bag containing naphthalene crystals (or other chemicals that are toxic to mites); if the fungus grows in a test tube, the lid must be loosened. Alternatively, a piece of gauze wrapped with naphthalene crystals can be plugged into the neck of each test tube. Place the petri dish containing the naphthalene crystals in the incubator and refrigerator for at least 1 week to remove mites in these areas. Avoid yeast assimilation tests near chemicals, because yeast can use the volatiles of chemicals as a carbon source, which can lead to false positive results. ^[9]

Another method of salvaging the culture is based on freezing, which can quickly kill mites, but the eggs can survive for 48 to 72 hours at -20 ° C. Therefore, it may be possible to save the culture by subculture the area that does not appear to be contaminated with mites after placing the culture at -20 ° C for at least 72 hours. It is very useful to use a dissecting microscope to pick the best colonies. ^[9]

Mite prevention

1. Go to the grass as little as possible.

2. Topical use Tongzhou spray. Supplementing vitamin B in moderation can greatly improve skin resistance. ·

3 Never give food such as seafood or cheese, as it will stimulate mites.

4 Keep the mats clean and dry. (Preferably regular disinfection)

5. Always bask in the sun and exercise more.

6. When using air conditioners, open the windows regularly to circulate air.

7. Keep the air dry and ventilated. Minimize dust.

8. Timely and regularly clean dusty dead corners in the living environment, such as air-conditioning filters, mattresses, carpets, flowers and fish farms.

9. Use less carpet in the living room.

10. Dry the bedding frequently. ^[1]