Originally Posted by yoscenario2000
I am a frequent highway cruiser and I am not sure if this has direct connection to the topic, but I've experience that my kids always get sick (throat infection/cold/cough) whenever I am on highway with re-circulation mode off.
Upper respiratory tract infections are completely different ball game. Pathogens can be transmitted by many number of ways including air, touch , food etc. What I mentioned in previous post was in relation to symptoms of high levels of Carbon Dioxide in air. Infant brains are more sensitive to changes as they were not fully developed.
In case of your children before you conclude it is "recirculation off" please consider other variables like car ( air filter to be precise), atmosphere, season, route, eating anywhere outside during journey, signs of infection for anyone in car prior to journey etc.
These variables are very difficult to control and thus you cannot attribute this to "recirculation off" alone.
Please remember, in medical research one rule is:
"Correlation does not mean causation "