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USMLE® Step 1 questions

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A 28-year-old woman presents to the clinic due to red eyes and a sore throat. The patient’s symptoms started three days ago after going to a spa. Additionally, the patient had a fever and chills for one day, but this resolved independently. Physical examination shows increased bilateral tearing and erythema in the conjunctiva, swollen tonsils with a white exudate covering them, and enlarged mandibular lymph nodes. A DNA virus is suspected as the cause. Which is the most likely cause of this patient’s condition?

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characteristics of p. 161

conjunctivitis p. 553

pneumonia p. NaN

viral envelope p. 160

Conjunctivitis p. 553

adenoviridae p. 161

Hemorrhagic cystitis

adenoviridae p. 161

Myocarditis p. 481

adenovirus p. 161


adenoviridae p. 161

Pneumonia p. 707

adenoviridae p. 161


Content Reviewers

Adenoviruses are a group of viruses that cause respiratory, gastrointestinal, and genitourinary infections.

There are about 60 serotypes of the virus, divided into 7 subgroups, from A to G.

Common respiratory infections caused by adenoviruses include a sore throat, the common cold and pneumonia, whereas diarrhea is the most common gastrointestinal ailment.

Adenoviruses can also cause cystitis, which is the inflammation of the bladder, as well as eye conditions like conjunctivitis.

Adenoviruses are double-stranded linear DNA viruses surrounded by an icosahedral capsid, which is a spherical protein shell made up of 20 equilateral triangular faces.

And they’re “naked” because the capsid isn’t covered by a lipid membrane.

Their capsid is unique among viruses because it has fiber-like projections from each of the 12 vertices of the shell.

Adenovirus is primarily transmitted by respiratory droplets when someone coughs or sneezes and by the fecal-oral route.

In other words, you catch it by ingesting the stool or vomit particles of someone who is sick. Yuck.

This can happen if infected stool ends up in the water supply or on agricultural fields, if flies land on it, and transfers stool particles to other places, or by touching contaminated surfaces.

You can summarize it as the four Fs: fluids, fields, flies, and fingers. As a result, adenovirus can end up in food and drinking water.

Two less common modes of transmission are from mother to newborn via the cervical fluid in the birth canal, and following an organ transplant from a donor who has an adenovirus infection.

After entering the body, the virus heads for epithelial cells, like those that make up the respiratory, GI, or urinary mucosa, where it uses its fiber projections to bind to the coxsackie-adenovirus receptor on cell membranes. This allows it to get inside the cells.

Once inside, adenovirus has multiple cytopathic, or cell-damaging, effects, like blocking synthesis of cellular DNA and the production of proteins.


Adenovirus is a type of DNA virus that can cause respiratory infections, including the common cold, and also conjunctivitis or "pink eye." They can also cause more serious diseases such as pneumonia, bronchitis, and even meningitis, especially in immunocompromised individuals.

Adenovirus is spread through contact with respiratory secretions, such as saliva or mucus, from an infected person. They can also be spread through the fecal-oral route, and hand hygiene with water and soap or using sanitizers is the best way to prevent infection with adenovirus.


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