According to his own account, the President of the Swiss Vaccination Commission was held by a blackmailer for an hour at the end of March.
The doctor said this in a letter to various media on Sunday, from which the Keystone-SDA news agency quoted.
"During this time, he confronted me with a demand for a substantial amount of money," the alleged kidnapping victim continued in his statement.
Accordingly, the only economic interests of the perpetrator were in the foreground and the kidnapping had nothing to do with his role as head of the vaccination commission.
When he assured the kidnapper that he would meet the demands, he let him go.
After the doctor had informed the police, officials came across a 38-year-old German who had lived in Switzerland for a long time.
When the arrest was attempted on Wednesday evening in Wallisellen near Zurich, there was an exchange of gunfire.
According to the police, the 38-year-old killed his 28-year-old companion.
He was so badly injured by police shots that he died.
A 34-year-old Swiss man was also arrested in connection with the investigation.
Further details initially remained unclear.