BSNC 6000 Mod 7-9: HIV + SLE +
Cellulitis Exam Questions & Answers
(Grade A+)
What is the window for taking PEP after HIV exposure? -
correct answer ✅must take within 72 hours max
How should a patient take PEP? -
correct answer ✅Once a day for 28 days after exposure
PrEP is a combination of ______ HIV medications, while PEP is a
combo of ________. -
correct answer ✅PrEP is a combination of 2 HIV medications,
while PEP is a combo of 3.
If a patient is doing on-demand PrEP, when should they take their
medication? -
correct answer ✅2 pills 2-24 hours pre-sex
1 pill 24 hours later
1 pill another 24 hours later
Con't to take every 24 hours until 2 days after the last time person
has sex
,BSNC 6000 Mod 7-9: HIV + SLE +
Cellulitis Exam Questions & Answers
(Grade A+)
What are the 2 types of PrEP available in Canada and which is most
commonly used? -
correct answer ✅TDF + FTC (more common, available in generic
form, less expensive, often covered by pharm plans)
TAF + FTC (aka Descovy, more expensive, not usually covered by
provincial plans as only brand name available)
Why is it important to repeat a negative HIV test 3 months post-
exposure? -
correct answer ✅Usually results are accurate after 3 weeks, BUT it
can take up to 3 months after exposure for HIV to show up
Broadly speaking, how do people usually become infected with
HIV? -
correct answer ✅Dendritic cells are exposed to the virus (e.g. via
sexual contact
o Immune cells embedded in mucous membranes
o Protrude limbs to surface of mucous membranes to sample
environment
o Continually grab onto particles and pull them across membrane
, BSNC 6000 Mod 7-9: HIV + SLE +
Cellulitis Exam Questions & Answers
(Grade A+)
o Ingest and display antigen if worried about particle
o Cell then leaves through the lymph or blood
Explain the 3 mechanisms by which humans become infected
w/HIV via dendritic cells -
correct answer ✅1) Some HIV particles remain intact and are
brought to the lymph nodes stuck to outside of dendritic cell
-Hands off HIV cell to T cell -> T cell usually becomes infected
2) Dendritic cells may also endocytose a group of HIV particles to
lymph node
-Exocytosis -> cells in lymph can then become infected
3) HIV can also directly infect the dendritic cell in the mucous
membrane or as it travels to the lymph node
-Dendritic cell will start pumping out copies HIV particles into
lymph nodes
How does HIV infect CD4 (or helper T) cells? -
correct answer ✅CD4 (helper T cells) have 2-3 receptors
-CD4 receptor (main receptor) +
-CCR5 and/or CXCR4
Cellulitis Exam Questions & Answers
(Grade A+)
What is the window for taking PEP after HIV exposure? -
correct answer ✅must take within 72 hours max
How should a patient take PEP? -
correct answer ✅Once a day for 28 days after exposure
PrEP is a combination of ______ HIV medications, while PEP is a
combo of ________. -
correct answer ✅PrEP is a combination of 2 HIV medications,
while PEP is a combo of 3.
If a patient is doing on-demand PrEP, when should they take their
medication? -
correct answer ✅2 pills 2-24 hours pre-sex
1 pill 24 hours later
1 pill another 24 hours later
Con't to take every 24 hours until 2 days after the last time person
has sex
,BSNC 6000 Mod 7-9: HIV + SLE +
Cellulitis Exam Questions & Answers
(Grade A+)
What are the 2 types of PrEP available in Canada and which is most
commonly used? -
correct answer ✅TDF + FTC (more common, available in generic
form, less expensive, often covered by pharm plans)
TAF + FTC (aka Descovy, more expensive, not usually covered by
provincial plans as only brand name available)
Why is it important to repeat a negative HIV test 3 months post-
exposure? -
correct answer ✅Usually results are accurate after 3 weeks, BUT it
can take up to 3 months after exposure for HIV to show up
Broadly speaking, how do people usually become infected with
HIV? -
correct answer ✅Dendritic cells are exposed to the virus (e.g. via
sexual contact
o Immune cells embedded in mucous membranes
o Protrude limbs to surface of mucous membranes to sample
environment
o Continually grab onto particles and pull them across membrane
, BSNC 6000 Mod 7-9: HIV + SLE +
Cellulitis Exam Questions & Answers
(Grade A+)
o Ingest and display antigen if worried about particle
o Cell then leaves through the lymph or blood
Explain the 3 mechanisms by which humans become infected
w/HIV via dendritic cells -
correct answer ✅1) Some HIV particles remain intact and are
brought to the lymph nodes stuck to outside of dendritic cell
-Hands off HIV cell to T cell -> T cell usually becomes infected
2) Dendritic cells may also endocytose a group of HIV particles to
lymph node
-Exocytosis -> cells in lymph can then become infected
3) HIV can also directly infect the dendritic cell in the mucous
membrane or as it travels to the lymph node
-Dendritic cell will start pumping out copies HIV particles into
lymph nodes
How does HIV infect CD4 (or helper T) cells? -
correct answer ✅CD4 (helper T cells) have 2-3 receptors
-CD4 receptor (main receptor) +
-CCR5 and/or CXCR4
