- Global Impact: Ticks act as reservoirs for fungi, protozoa,
viruses, and bacteria, causing over 100,000 human illnesses annually.
- Major Vectors in India:
- Haemaphysalis spinigera & H. turturis (KFD)
- Hyalomma anatolicum anatolicum (CCHF)
- Rhipicephalus sanguineus (ITT)
- Ixodes ricinus (Lyme Disease)
- Transmission Cycles:
- KFD & Lyme: Infected by small mammals; the nymphal
stage is most infective to humans.
- CCHF & ITT: Transovarial transmission; in CCHF, the
adult tick is the infective stage.
- Human-to-Human Spread: Occurs only in CCHF through
contact with infected blood or body fluids.
- Kyasanur Forest Disease (KFD): Karnataka, Goa, Maharashtra, Kerala,
and Tamil Nadu (Western Ghats).
- CCHF: Reported in Gujarat, Rajasthan, and Uttar Pradesh.
- Other Diseases: ITT (Tamil Nadu, Pondicherry, Delhi, UP,
Karnataka), Lyme (Kerala), and Q Fever (Puducherry).
- Peak Risk Period: Outbreaks typically occur from December
to June.
- Personal Protection: Use of repellents, protective clothing, and
gumboots in endemic areas.
- Vaccination: Residents in endemic areas should receive the
formalin inactivated tissue culture Vaccine.
- Animal Hygiene: Regular tick removal from domestic animals to
reduce local populations.
- Outbreak Protocol: Prohibit forest visits during peak season
(Dec–June), especially near monkey death sites.
- Environmental Control:
- Apply Malathion 5% or 25% powder within a 50-foot radius of
a monkey death.
- Fire can be lit along footpaths to clear questing ticks.
- Large-scale spraying is generally not feasible due to inaccessible terrain.
Reference:
A. Elango. Hands-on Training Module on Medically Important Hard Ticks (Ixodidae). ICMR-Vector
Control Research Centre (VCRC), Puducherry, 2022.
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