On admission, dyspnea, fever, anorexia, asthenia, headache, myalgia, chills, cough, abdominal pain, cyanosis, abnormal breathing sounds, hypotension (systolic blood pressure [SBP] <100), pulse rate, temperature, and respiratory frequency were recorded, A pseudoinfluenza course was understood to mean that the patients had a high fever, myalgia, headache, asthenia, and usually no rhinorrhea.
Pseudoinfluenza syndrome was found in 17 (68%) patients.
The first (n = 2), probably the least known, corresponds to patients with only prodromal symptoms, especially a pseudoinfluenza course with no pulmonary involvement, who are often not admitted to a hospital and are not recognized to have HPS.