Lyme disease is a bacterial infection caused mainly by Borrelia burgdorferi. It is transmitted through the bite of infected black-legged (deer) ticks.
🧫 Cause & Transmission
Lyme disease is spread by:
- Infected black-legged (deer) ticks
- Tick bites that usually remain attached for 24–48 hours
-
Exposure in:
- Wooded areas
- Grasslands
- Outdoor vegetation
⚠️ Early tick removal greatly reduces infection risk.
⚠️ Early Symptoms (Stage 1 – Early Localised)
Symptoms usually begin within days to weeks.
🌡️ Common early signs:
- Fever
- Fatigue
- Headache
- Muscle aches
- Joint pain
🎯 Key sign:
-
Expanding red rash called erythema migrans
- Often shaped like a “bulls-eye”
- Appears in around 70–80% of cases
🧠 Stage Progression
Lyme disease develops in stages if untreated:
🧩 Stage 2 – Early Disseminated
The bacteria spreads through the body:
- Multiple skin rashes
- Facial paralysis (Bell’s palsy)
- Heart problems (palpitations, rhythm changes)
- Dizziness
- Worsening fatigue
🧩 Stage 3 – Late Disseminated
Occurs months or years later:
- Severe joint pain (especially knees)
- Arthritis-like symptoms
- Long-term neurological issues
- Cognitive problems (“brain fog”)
⚠️ Complications
If untreated, Lyme disease can lead to:
- Chronic joint inflammation
- Long-term neurological damage
- Cognitive dysfunction
- Ongoing fatigue and pain
⚠️ Symptoms may become long-lasting or disabling.
🏥 Treatment
- Most cases are treated successfully with antibiotics
- Typical treatment lasts 2–4 weeks
- Early treatment prevents long-term complications
⚠️ Delayed treatment increases risk of chronic illness.
🛡️ Prevention
🧍 Personal protection:
- Wear long sleeves and trousers in grassy/wooded areas
- Use insect repellent (e.g. DEET)
- Avoid brushing against long grass or shrubs
🔍 After outdoor exposure:
- Check skin thoroughly for ticks
- Check scalp, behind ears, and underarms
🪳 Tick removal:
- Use fine-tipped tweezers
- Remove as soon as possible
🔬 Key Idea
Lyme disease is:
- A tick-borne bacterial infection
- Often starts with a bulls-eye rash
- Can progress from mild flu-like illness to serious neurological and joint disease
- Highly treatable if caught early
🧠 Study Questions (Answers found in module text)
🔍 Understanding
- What bacteria causes Lyme disease?
- How is Lyme disease transmitted?
- What environment increases tick exposure risk?
⚠️ Symptoms
- What is erythema migrans?
- What are early symptoms of Lyme disease?
- What can happen if Lyme disease spreads?
🧠 Progression
- What happens in Stage 2 Lyme disease?
- What are late-stage symptoms?
🏥 Treatment & Prevention
- How long is antibiotic treatment usually given?
- Why is early treatment important?
- What are key prevention methods?
📌 Final Summary
Lyme disease is a tick-borne bacterial infection that often begins with a bulls-eye rash and flu-like symptoms. If untreated, it can progress into serious neurological, heart, and joint complications, but it is usually highly treatable with early antibiotics.
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