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According to the WHO report, the rate of respiratory infections is still more than the other infections and all preventional programs have not been able to decrease the transmission rate of disease through the air, in spite of various recommendations. It is quite reasonable to assume that, in the case of bioterrorism attack, a large number of the people will be affected. Therefore study of the viability of the BIOAEROSOL s and involved parameters seems to be necessary. This study can provide good information for designing a computer program to predict the number of affected people and the borders of contaminated area, to provide a good defense against the BIOLOGICAL ATTACK, and to decrease the mortality and morbidity in a number of different ways such as gravitational setting of the particles. Also we will suggest some recommendation for a better personnel protection and safety of the buildings to prevent further infections.