Symptomerne omfatter næsten altid feber eller udslæt, men tit også kvalme, opkastninger, diarré, mavesmerter, hovedpine, tegn på leverskader i blodet, myalgi (muskelsmerter), dyspnø (vejrtrækningsproblemer), hoste, sløvhed og utilpashed.
Symptoms almost always include fever or rash, but also very commonly include nausea, vomiting, diarrhoea, abdominal pain, headache, signs of liver damage in the blood, myalgia (muscle pain), dyspnoea (difficulty breathing), cough, lethargy and malaise (feeling unwell).