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ù ø ø ø øºø ø Vaccination is a preventive strategy in fight against infectious diseases and it is one of the most effective weapons of health protection of the modern medicine. ø ù ø ø ù ø ø ø ù ø ø ù ø ù ùšø øºø ø year. ø ø ø ù ø ù øªø ùšø ùˆø ù øªùšøªø ù ùˆø ù ùš ù ø ø ø øºø ø by ibtisam hassan al aswad.