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Immune response. Bearded man sick. Cold flu concept. Body temperature. Headache virus symptom. First symptom. Suffer

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Immune response. Bearded man sick. Cold flu. First symptom. Headache virus symptom. Health care and medicines. Suffer Royalty Free Stock Photo

Immune response. Bearded man sick. Cold flu concept. Body temperature. Headache virus symptom. First symptom. Suffer pain. Fever and thermal regulation of immunity. More than just symptom of illness.