Transmission and infection of H5N1

barracks and the massive movements of troops helped its expansion. The researchers believe that the soldiers' immune systems were weakened by the strain of combat and chemical attacks, increasing the chances of contracting the disease. A factor in the transmission of the disease was the amount of travel of the combatants, which helped spread the virus across the Atlantic Sea. The modernization of transport systems allowed navigators to spread the pandemic more rapidly over a wider range of…