Which of the following are common clinical symptoms of alphavirus infection?

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Recognizing the range of common symptoms in alphavirus infections helps explain why all of these are included. Alphavirus infections typically present with a sudden fever and headache, and myalgia—muscle pains—is very common and often prominent. Vomiting can also occur as part of the systemic illness, especially with higher fever. Because each of these symptoms can appear with alphavirus infections, the option that includes vomiting, myalgia, and the abrupt fever/headache combination best reflects the typical symptom set. The other choices omit at least one common feature, making them less complete representations of the presentation.