I caught whooping cough last year. At 69 years of age. I don’t think anyone without direct experience has any idea at all just how bad it can be. Amongst all the bad things like vomiting I also passed out several times coughing so hard I couldn’t breath. Once behind the wheel of my car. I passed it on to my wife and 40 year old daughter. Has any research been done into why it causes such a bad cough?