Vaccination is a useful primary prevention against infectious diseases. In several countries, many infections are endemic and vaccines are usually provided free of charge by the local governments to the people. For vaccination, the assessment for the contraindication which is usually based on clinical history taking, is the primary requirement. Here, the experiences on a recent situation of free influenza vaccination is discussed. This review was based on the clinical history of 200 local patients who had attended a medical center in Bangkok, Thailand, during June 2018, asking for free influenza vaccination according to the local Thai public health policies. According to this report, it is observable that the clinical history taking is usually unreliable.