Ticks

Ticks are small, blood-sucking parasites that can infest humans, animals, and even birds in Sri Lanka.

Identification

  • Physical description: Ticks are wingless arachnids related to spiders and mites. They have flattened, oval-shaped bodies that expand when engorged with blood. Adult ticks are typically 3-10mm long, but engorged females can grow much larger. Their mouthparts are specialized for piercing skin and sucking blood.
  • Habitat: Ticks are found in a variety of habitats, including forests, grasslands, scrublands, and even urban areas with overgrown vegetation. They prefer areas with high humidity and moderate temperatures.
  • Feeding habits: Ticks are obligate blood feeders, meaning they need to feed on blood to survive. They wait on vegetation, brush against passing animals or humans, and latch onto a host to feed for several days until engorged.

Behaviour

  • Life cycle: Ticks undergo a complex life cycle with four stages: egg, larva, nymph, and adult. Depending on the species, the entire life cycle can take several months to over a year.
  • Activity patterns: Ticks are most active during warm, humid weather. They are particularly active at dawn, dusk, and after rainfall when humidity is high.

Signs of Infestation

  • Visual signs: Finding a tick attached to your skin or your pet’s fur is the most obvious sign of infestation. You might also notice red, itchy bumps at the site of tick bites.
  • Behavioral signs: Restlessness and scratching in pets can indicate tick infestation.

Health Risks

Ticks in Sri Lanka can transmit various diseases to humans and animals, including:

  • Spotted fever group rickettsiosis: This bacterial infection causes fever, headache, muscle aches, and a rash.
  • Babesiosis: This parasitic disease affects red blood cells and can cause fever, fatigue, hemolytic anemia (destruction of red blood cells), and dark urine.
  • Anaplasmosis: Another bacterial infection causing fever, fatigue, muscle aches, and loss of appetite.

Prevention Tips

  • Avoid tall grass and overgrown areas when outdoors.
  • Wear long pants and long-sleeved shirts when hiking or spending time in tick-infested areas.
  • Use insect repellents containing DEET or picaridin on exposed skin.
  • Perform regular tick checks on yourself and your pets after spending time outdoors.
  • Treat pets with veterinarian-approved tick prevention medication.

Common Tick Species in Sri Lanka

  • Dermacentor auratus: Commonly found on humans and animals, known to transmit spotted fever rickettsiosis.
  • Amblyomma testudinarium: Another common tick on humans and animals.
  • Haemaphysalis intermedia: Primarily infests domestic animals and wildlife, but can also bite humans.
  • Rhipicephalus microplus: Primarily a parasite of cattle, but can bite humans.