Which of the following best represents an example of infectious disease spreading via a vector?
Being bitten by an infected mosquito
A group of partygoers hugging and shaking hands
Disease spreading from infected mother to infant via the placenta
Two persons, one of whom is infected, sharing a glass of soda
The Correct Answer is A
A. Being bitten by an infected mosquito: A vector is an organism (e.g., a mosquito, tick, or flea) that transmits pathogens from one host to another. Mosquitoes transmit diseases like malaria, dengue fever, and Zika virus.
B. A group of partygoers hugging and shaking hands: This describes direct contact transmission, not vector-borne transmission.
C. Disease spreading from infected mother to infant via the placenta: This describes vertical transmission (from mother to child during pregnancy), not vector-borne transmission.
D. Two persons, one of whom is infected, sharing a glass of soda: This describes indirect contact transmission through fomites (contaminated objects), not vector-borne transmission.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. "Salmonella is a bacterial infection." Salmonella is a gram-negative bacterium that causes foodborne illness.
B. "Salmonella symptoms include headaches, abdominal pain, diarrhea, nausea, vomiting, and fever." These are common symptoms of Salmonella infection, particularly gastroenteritis.
C. "Salmonella may be spread by spores that form once contaminated blood is exposed to the air." Salmonella is a bacterial infection that spreads primarily through contaminated food, water, or direct contact with infected animals. It does not form spores, and exposure to air does not play a role in its transmission.
D. "Salmonella has a 48-hour incubation period." While the incubation period can range from 6 to 72 hours, 48 hours falls within the expected time frame.
Correct Answer is B
Explanation
A. Reassure the student that it is just a bad cold and will soon pass: This dismisses the symptoms and delays necessary public health intervention.
B. Inform all students, staff, and faculty of a possible measles exposure: Koplik spots (small white spots inside the cheeks) are a classic early sign of measles, which is highly contagious. Prompt notification is needed to prevent an outbreak.
C. Inform all students, staff, and faculty of a possible rubella epidemic: While rubella also causes a rash, it does not present with Koplik spots.
D. Tell the student to take two acetaminophen and drink lots of fluids: Symptomatic relief is important but does not address the risk of measles transmission.
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