Rachel
About
Khan Academy on a Stick
Pertussis complications
Pertussis
What is pertussis?
Pertussis complications
Pathophysiology of pertussis
Pertussis diagnosis and treatment
Pertussis vaccine
Your browser does not support Flash or HTML5 video. You can:
upgrade your browser
install Flash
try this direct link
If the above player doesn't work,
try this direct link
.