Mouth larvae are parasites that hatch and live inside the oral cavities of human and animal hosts. These pests can cause a dangerous infection called oral myiasis. This disorder rarely occurs in humans, but it can affect people living and traveling in developing countries. Certain conditions can make you more prone to oral myiasis. Here’s what you need to know about mouth larvae species, the common causes of these creepy pests, and how to get rid of them.
What Is Mouth Larva?
A larva is an insect that’s hatched from an egg but hasn’t developed wings yet. Mouth larva usually comes from certain fly species that invade soft tissues inside the oral cavity, such as gums and open wounds. These pests typically infect livestock and other vertebrate animals in tropical areas, but they can affect humans in rare cases. People can get oral myiasis by eating foods containing larvae. Flies can also enter the mouth and lay eggs in wounds.
What does a mouth larva look like?
This pest’s appearance varies depending on the type of larva.
Screwworm fly larvae get their name from their screwlike appearance. One end of their body is blunt, while the other is pointy. They have cylindrical, creamy white bodies that turn reddish-pink as the larvae mature.
Flesh fly larvae have long, white bodies with narrow heads. They can grow to 9-13 millimeters long in their final larval phase. The bodies of flesh fly larvae grow darker as they progress through pupal development.
Human botfly larvae are commonly known as white maggots. Their appearance evolves as the larvae move through three stages. The larvae begin as small, wormlike creatures with one narrow end and one bulbous end. During the second stage, the larvae’s bodies grow in size and narrow into a bottle shape. In the third stage, the larvae’s bodies become cylindrical. The botfly mouth larvae’s bodies are ringed with dark spines at each phase.
Horse botfly larvae typically burrow into the mouths of horses. These pests have off-white bodies with narrow ends and rings of spines. They measure up to 1/2 inch long.
What do mouth larvae eat?
These parasites feed on the dead or living tissue of their hosts. They can also eat bodily fluids and ingested food that gets caught in the mouth.
As mouth larvae feed on their hosts, they produce toxins and attract bacteria that release compounds that cause the host’s tissue to decay. This makes it easier for the larvae to burrow inside and eat.
What is the life cycle of mouth larvae?
Each species of mouth larvae has a unique life cycle, but these pests typically have similar life stages.
The adult human botfly glues its eggs to the bodies of blood-sucking insects, such as mosquitoes. When the insect drinks blood from a bird or mammal, the botfly larvae enter the host’s tissue. The immature botflies find a suitable cavity in the host’s body and feed on their tissue for 5-10 weeks.
After reaching maturity, the larvae emerge from the host and bury themselves in the ground, turning into pupae. Then, they mature into adult flies in two to three weeks.
Types of Mouth Larvae
Experts estimate that over 80 species of flies can cause mouth larvae. Here are four mouth larvae species discovered in humans:
Screwworm fly (Cochiliomyia hominivorax). This species lives in tropical and semitropical regions of the Western Hemisphere, including the Caribbean and some parts of South America. The female screwworm fly lays eggs on mucous membranes or wounds, and the larvae burrow into the tissue after hatching. This pest commonly affects livestock and pets and can cause death if wounds are left untreated.
Human botfly (Dermatobia hominis). The human botfly lives in Central and South America. Adult human botflies resemble bumblebees and lay larvae in mammals’ skin, mouth, and other tissues.
Flesh fly (Sacrophagidae). This pest has a wide range, occurring in areas such as Greenland, Central America, and North America. These flies can infect living hosts and feed on human and animal remains.
Where Do Mouth Larvae Live?
Mouth larvae live in tropical and subtropical countries with humid, warm environments, such as India and South America. They often occur in poor rural areas with ba living conditions.
People in the Northern Hemisphere and Europe rarely have oral myiasis. Most Americans who develop this condition get the parasites while traveling in Africa and South America.
Signs You Have Mouth Larvae
Symptoms of mouth larvae include:
- Damage to oral tissues
- Lesions (sores)
- Mild to acute pain
- Necrotic gums
- Pulsating extraction wounds
- Oozing sores
Seek medical treatment immediately if you think you have mouth larvae.
Why Do You Get Mouth Larvae?
Mouth larvae typically infect people with conditions that affect their ability to close their mouths. Oral myiasis has been linked to:
- Alcoholism
- Dental extraction
- Mental illness
- Mouth breathing while asleep
- Nosocomial infection
- Psychiatric disorders
- Seizures
- Senility
- Substance abuse
Poor oral hygiene and trapped food debris can make your mouth an attractive place for flies to lay eggs.
Health Risks of Mouth Larvae
Oral myiasis can cause many side effects, including:
- Extreme pain
- Inflammation in the mouth
- Larvae rupture
- Permanent tissue damage
Severe infestations of mouth larvae can be fatal without proper treatment.
How to Treat Mouth Larvae
Health care professionals can treat mouth larvae by topically applying chloroform, mercuric chloride, mineral oil, or turpentine. These substances suffocate the larvae and force them to emerge from mouth tissues for oxygen.
After this application, a doctor typically extracts the mouth larvae surgically using clinical pincers or hemostats. Lidocaine is sometimes injected into cysts to push larvae to the surface.
Patients should receive antibiotics to treat secondary bacterial infections caused by mouth larvae, along with multivitamins to supplement their diet.
How to Get Rid of Mouth Larvae
Treatment for oral myiasis requires surgical removal of the invading pests. Patients typically recover fully after mouth larva removal. Ways to prevent mouth larvae include:
- Getting rid of local fly populations
- Improving community hygiene
- Maintaining personal cleanliness
- Monitoring people with mental and physical disabilities for signs of oral myiasis
- Practicing good oral hygiene
Travelers should exercise extra care when visiting areas known for myiasis. Applying insect repellant, wearing long sleeves and pants, and using mosquito nets can help protect you from mouth larvae.
Mouth Larvae FAQs
Can mouth larvae be cured?
Yes. Treatment usually includes topical chloroform, mercuric chloride, mineral oil, or turpentine to suffocate the larvae. Then, your doctor can remove the mouth larvae, usually with hemostats.
Is mouth larva rare?
Mouth larvae rarely affect humans. They typically infect livestock and other animals in tropical areas.