Causes. Pertussis, a respiratory illness commonly known as whooping cough, is a very contagious disease caused by a type of bacteria called Bordetella pertussis.ransmission. Pertussis is a very contagious disease only found in humans. It is spread from person to person. People with pertussis usually spread the disease to another person by coughing or sneezing or when spending a lot of time near one another where you share breathing space.
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1. Unoptimized Images. This is usually the most common reason for slow websites; there are lots of images, all of which are full-size and uncropped. For information on optimizing your images, see our article 6 Ways To Optimize An Image. Believe it or not, your website could be slow through no fault of your own.