CDC is not an independent research facility and when does a gun follow under the realm under CDC, now wait for it ...... it does not which is why it is not in their scope.
CDC works 24/7 to protect America from health, safety and security threats, both foreign and in the U.S. Whether diseases start at home or abroad, are chronic or acute, curable or preventable, human error or deliberate attack, CDC fights disease and supports communities and citizens to do the same.
Is a gun considered a disease in your mind,I guess a gun in theroy can sneak across the border with a vial of bubonic plague and spread it about,but I have never seen a gun with traction control or advailable in 4x4 models,so in winter or snow it would be tough to move about.