Filariae

Question 1

Answer 1

Wuchereria bancrofti

periodic nocturnal - blood needs to be collected between 22.00 and 0400 (peak at 24)

subperiodic nocturnal (thailand and vietnam) - blood needs to be collected 20-22 (peak at 21)

subperiodic diurnal (south east pacific) - blood collected 14-18 (peak at 16)

sheathed - sheath stains pale

body curves are large and few

body nuclei distinct and less than other species

no nuclei in tail end

Question 2

Answer 2

Brugia malayi

periodic nocturnal (south and east asia) - blood needs to be collected 22-04 (peak at 24)

subperiodic nocturnal (south east asia) - 20-22 (peak at 21)

sheathed

body is kinked with many angular curves

nuclei are large, dense and stain darkly

sheath stains dark pink with giemsa

periodic b. malayi often seen unsheathed

2 nuclei at terminal end

Question 3

Answer 3

Loa loa - Loiasis

body has several curves and kinks

nuclei extended to tail tip

sheathed

nuclei not distinct - dense and stain darkly

sheath does not stain with giemsa

Question 4

Answer 4

Mansonella ozzardi

unsheathed

body nuclei not distinct - anterior nuclei are positioned side by side

tail is pointed and tip does not contain nuclei

Question 5

Answer 5

Mansonella perstans

small and thin

unsheathed

body nuclei are irregular

end of tail is rounded with large nucleus at the tip

Question 6

Answer 6

Onchocerca volvulus - onchocerciasis

large and thick

found in skin

unsheathed

no nuclei at the end of the pointed tail

anterior nuclei positioned side by side

globular head

Question 7

Answer 7

Mansonella streptocerca

unsheathed and found in skin

nuclei extend to tip which is usually hooked