Microbiology

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Updated: May 11, 2026 at 7:04 PM

Microbiology

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Microbiology

May 12, 2026, 03:26 AM

Follow the Doctor usmle channel on WhatsApp: https://whatsapp.com/channel/0029Va5uYgUKGGGNpDS2LJ2X

17,800

Microbiology

May 12, 2026, 03:26 AM

Correct Answer - A
Answer- A- Staphylococcus aureus
Staph food poisoning is characterized by a sudden start of nausea,
vomiting, and stomach cramps. Most people also have diarrhea.
Symptoms usually develop within 30 minutes to 6 hours after eating
or drinking an item containing Staph toxin and last no longer than 1
day. Severe illness is rare.
The illness cannot be passed from one person to another

16,200

Microbiology

May 12, 2026, 03:26 AM

[poll]

23,900

Microbiology

May 12, 2026, 03:26 AM

Correct Answer - A
Answer-A- Cryptosporidium
* The origin of infectious diarrhea in patients with AIDS can be
divided into 2 general categories: that caused by common
pathogens and that caused by opportunistic pathogens.
* The most common infectious organisms causing AIDS-related
diarrhea include
- Cytomegalovirus (CMV)
- The parasites Cryptosporidium,
- Microsporidia
- Giardia lamblia
* And the bacterium Mycobacterium avium-intracellulare (MAC).
* Other bacteria and parasites that cause diarrheal symptoms in
otherwise healthy people may cause more severe, prolonged or
recurrent diarrhea in people with HIV or AIDS

17,000

Microbiology

May 12, 2026, 03:26 AM

[poll]

27,200

Microbiology

May 12, 2026, 03:26 AM

Correct Answer - C
Answer- C, IL 4
IgE is produced by plasma cells located in lymph nodes draining the
site of antigen entry or locally, at the sites of allergic reactions, by
plasma cells derived from germinal centers developing within the
inflamed tissue.
IgEantibody production requires TH2 cells that produce interleukin-4
(IL-4) and IL-13 and it can be inhibited by TH1 cells that produce
interferon-γ (IFN-γ).

17,200

Microbiology

May 12, 2026, 03:26 AM

[poll]

34,100

Microbiology

May 12, 2026, 03:26 AM

Correct Answer - D
Ans: D. Schwannoma
spindle cells and verocay bodies are seen in schwannoma
is a tumor of the tissue that covers nerves, called the nerve sheath.
These tumors develop from a type of cell called a Schwann cell,
which gives them their name. Schwannomas are often not
cancerous (benign).
The most common type of schwannoma is vestibular schwannoma.
It affects the nerve responsible for balance (also called the vestibular
nerve). It can cause inner ear deafness because the hearing and
balance nerve run together, and as the tumor grows it damages the
hearing nerve (cochlear nerve). Because of this doctor used to call
them acoustic neuromas.
Microscopically, the tumor is composed of fibrocellular bundles
forming the whorled pattern.
There are areas of dense and compact cellularity (Antoni Apattern) alternating with loose acellular areas (Antoni B
pattern). Areas of Antoni A pattern show palisaded nuclei
called Verocay bodies.
Nerve fibers are usually found stretched over the capsule but not
within the tumor.
Areas of degeneration contain haemosiderin and lipid-laden
macrophages.
Schwann cells characteristically express S-100 protein.
A schwannoma rarely ever becomes malignant.

17,900

Microbiology

May 12, 2026, 03:26 AM

[poll]

26,100

Microbiology

May 12, 2026, 03:26 AM

[poll]

28,200

Microbiology

Apr 1, 2026, 01:04 PM

Correct Answer - A
Ans. is 'a' i.e., Gametocyte harbourers are carrier
* The individual who harbours the gametocytes is known as a
carrier.
* Only ring form (young trophozoites) and gametocytes are seen in
peripheral blood.
* Schizont of P. vivax almost completely fills an enlarged R. B. C.

29,000

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