The acute infection stage refers to the first weeks after infection, where the majority of infected individuals display severe flu-like symptoms such as fever, myalgia, sore throat, swollen lymph nodes, arthralgia, fatigue, headache, and sometimes rash.
This phase is marked by the initial stages following contamination, characterized by severe flu-like symptoms such as high fever, muscle aches, sore throats, swollen lymph nodes, joint pains, exhaustion, headaches, and rashes.