Prof. Dr. Mehmet Ceyhan: ‘Families cannot afford meningitis vaccines because they are expensive’
Consumers Union files criminal complaint against Mehmet Ceyhan
Striking 'monkeypox' warning from Mehmet Ceyhan: 'The state must silence them'
Disease from 54 years ago has returned: Famous professor from the pandemic era issues warning
Prof. Dr. Mehmet Ceyhan: 'Turkey has gone back 100 years in terms of science'