This study covers the first trial of the Crimean-Congo Hemorrhagic fever virus (CKKA) vaccine on humans (healthy volunteers), which has been developed in Turkey and has completed preclinical toxicology studies to be performed on experimental animals. Also, this study is a Phase I, randomized, double-blind, national, single-center, placebo-controlled study that is designed to evaluate the safety and efficacy of the CKKA vaccine. A total of 60 (12 + 48) healthy male and/or female volunteers will be participating in this study, and the study is planned to last approximately one year.

Inclusion Criteria:

• Healthy, white in the 18-55 age range, men and/or women who agree not to become pregnant until 2 months after the start of the last vaccination
• Body weights are at limits to exclude anorexia or obesity (The BMI limits accepted for this study are 18.5-30 kg /m2)
• According to clinical and standard laboratory tests, physical and spiritually healthy volunteers.

Exclusion Criteria:

• The 20 days before the study any vaccination applied volunteers
• Persons with clinically significant liver, kidney, gastrointestinal, cardiovascular, psychiatric, pulmonary, hematologic, endocrinological, or other significant acute or chronic abnormalities in the medical history of the volunteer or in the examination.
• Volunteers who have previously had any pulmonary infection or have previously used immunosuppressive drugs (including corticosteroids) for any reason