What are common symptoms of listeria infection?

A listeria infection, caused by the bacterium Listeria monocytogenes, typically presents with a range of symptoms, and mild fever, headache, and vomiting are indeed common early signs of this infection. These symptoms often occur as the body responds to the presence of the bacteria, particularly following consumption of contaminated food or beverages.

In individuals at higher risk, such as pregnant women, the elderly, and those with weakened immune systems, these symptoms can progress to more severe manifestations, such as meningitis or septicemia. Thus, recognizing the initial symptoms like mild fever, headache, and vomiting is important for prompt identification and treatment.

The other symptoms listed in the question, while they can occur in various illnesses, are not typically associated with listeria infection. Severe abdominal cramps and diarrhea are often seen with other gastrointestinal infections. Similarly, coughing and difficulty breathing are more indicative of respiratory infections rather than a listeria infection. High blood pressure and fatigue are not specific symptoms of listeria and can be related to a wide range of other health issues. Consequently, option B accurately identifies the common initial symptoms of listeria infection.