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Wound myiasis Wound myiasis occurs when fly larvae infest open wounds of a mammalian host This kind of infestation may be the result of facultative or 

Myiasis

Myiasis is the infestation of the organs or tissues of host animals by the larval stages of dipterous flies, usually known as maggots or grubs The fly larvae feed  

Myiasis

Myiasis can be accidental, when fly larvae occasionally find their way into the human body, or facultative, when fly larvae enter living tissue opportunisti-

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Oral Myiasis is a rare pathology in humans and is associated with poor oral hygiene, alcoholism, senility, supuranting lesions, severe halitosis and others 

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Myiasis refers to the infestation of living humans and vertebrates with fly larvae that feed on necrotic or vital tissue of the host Since the invasion of new fly 

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[PDF] Myiasis - Centre for Health Protection

Myiasis is the invasion of organs and tissues of humans or vertebrate animals by fly larvae (maggots) Elderly people who are bedbound, have physical

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Myiasis: Diagnosis, Treatment and Medical Use of INDEX TERMS: myiasis, maggots, fly larva Myiasis refers to infestation of vertebrates by fly larva

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- Communicable Diseases

Series

Myiasis is the invasion of organs

and tissues of humans or vertebrate animals by ?y larvae (maggots). Elderly people who are bedbound, have physical disability or lack self-care ability are more vulnerable to ?y invasion of their body parts not protected by skin, such as wounds and mucous membranes.

Many types of ?ies can cause myiasis in humans

or animals, such as

Oestridae

, Calliphoridae and

Sarcophagidae

. In Hong Kong,

Chrysomya

bezziana of the family Calliphoridae is a common species that causes human myiasis.

The life cycle of

Chrysomya bezziana

comprises four stages, namely, egg, larva, pupa and adult. An adult female ?y only lays eggs on live animals, usually on super?cial wounds, mucous membranes or body ori?ces such as the mouth, the ear and the nose of debilitated persons. The eggs usually hatch within 24 hours and the larvae burrow into the host's tissue and feed on the host's dead or living tissue.

Penetration of the host"s tissue and feeding

activity of the larvae may cause serious tissue damage, often accompanied by putrid smelling discharges and ulcerations, resulting in loss of organ function, injury to the skin, secondary bacterial invasion and death.

To prevent myiasis infestation, members of

the public (especially caretakers of susceptible persons and staff of elderly homes while taking care of their residents) are advised to observe the following measures:

Maintain good personal

hygiene

Bathe daily and keep

skin clean

Maintain good oral hygiene

Proper wound management

All wounds should be treated promptly

and dressed properly. Wash hands before and after touching wounds

Wounds should be assessed regularly.

Dressings should be kept clean and dry

Seek medical attention if there is

suspected wound infection and delayed wound healing

Maintain good environmental hygiene

Keep premises clean

Store food in refrigerator or

cover the food with screen

Refuse should be kept in

containers with tight-?tting lids and disposed of regularly

Dead bodies of animals should

be disposed of properly

Fly proofing measures

Install ?y screening, insect electrocuting

device or ?y trap

Keeping of pet

All wounds on animals should be treated

promptly and properly

Pets, particularly dogs, have to be exam

ined by veterinary surgeons regularly

Animals with suspected myiasis should be

brought to the attention of veterinarians

Do not feed stray animals or keep them as

pet

Staff of elderly homes should ensure good

environmental hygiene, be alert to inmates developing symptoms of the disease and seek medical consultation promptly for inmates feeling unwell. Further advice on fly prevention and control could also be obtained from the Pest Control Advisory

Section of the Food and Environmental Hygiene

Department.

2833 0111

Centre for Health Protection Websitewww.chp.gov.hk

Health Education Infoline of

the Department of Health Acknowledgement: Tuen Mun Hospital for providing pictures of the

Adult and Larva of

Chrysomya bezziana

Revised in December 2019

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