Infestations

Question 1

Which sphirochaete causes lyme disease?

Answer 1

Borrelia burgdorferi

Question 2

What are the three stages of lyme disease?

Answer 2

Erythema chronicum migrans
Borrelia lymphocytoma
Acrodermatitis chronica atrophicans

Question 3

When does ECM occur following a tick bite?

Answer 3

Within a month

Question 4

How does ECM in lyme disease present?

Answer 4

Expanding solitary macule/annular lesion

Resolves within a month untreated

Question 5

How long after the initial tick bite does borrelia lymphocytoma occur?

Answer 5

6 months

Question 6

What are the cutaneous signs and symptoms of borrelia lymphocytoma?

Answer 6

Firm, bluish red swelling
Ear lobes of kids/nipples of adults
Tender local lymphadenopathy

Question 7

What are the clinical signs and symptoms of acrodermatitis chronica atrophicans?

Answer 7

Blue/red discolouration progressing onto atrophy

Question 8

How long after the tick bite does acrodermatitis chronica atrophicans present?

Answer 8

6.5-8 years

Question 9

How can lyme disease be prevented?

Answer 9

Tick repellant
Early removal of tick
Doxy 200mg within 72 hours of bite

Question 10

What reaction occurs in 15% of people being treated for lyme disease?

Answer 10

Jarisch-Herxhemier

Question 11

What causes scabies?

Answer 11

Sarcoptes scabei

Question 12

How does scabies present?

Answer 12

Asymptomatic for up to 6 weeks
Delayed hypersensitivity reaction then develops
Biggggg itch

Question 13

What can be seen on examination of scabies?

Answer 13

Burrows on fingers/wrists
Mites in burrows
Excoriations, vesicles, papules, scabetic nodules

Question 14

How is scabies investigated?

Answer 14

Extractoin of mite, scrapings + microscopy

Question 15

How is scabies treated?

Answer 15

Permethrin cream

Question 16

How is head lice treated?

Answer 16

Physical removal

Malathion cream

Question 17

How long after infection do symptoms arise with head lice?

Answer 17

up to 2 weeks