The Triassic Period. At the start of the Triassic period, 250 million years ago, the earth was just recovering from the Permian/Triassic Extinction, which witnessed the demise of over two-thirds of all land-dwelling species and a whopping 95 percent of ocean-dwelling species.
Causes. Pertussis, a respiratory illness commonly known as whooping cough, is a very contagious disease caused by a type of bacteria called Bordetella pertussis.These bacteria attach to the cilia (tiny, hair-like extensions) that line part of the upper respiratory system.auses. Pertussis, a respiratory illness commonly known as whooping cough, is a very contagious disease caused by a type of bacteria called Bordetella pertussis.
SYNONYM OR CROSS REFERENCE: Originally named Haemophilus pertussis F, Whooping cough. CHARACTERISTICS: Bordetella pertussis are small, gram-negative, encapsulated, non-motile, coccobacilli with outer pili.They are generally about 0.5-1.0 Âµm in size. Some have reported that the bacteria are covered with surface slime or biofilm composed of carbohydrates.ATHOGENICITY/TOXICITY: B. pertussis is a respiratory pathogen that causes pertussis, also known as whooping cough, a localized infection of the ciliated epithelium of the bronchial tree. The disease affects mainly children, but adults have also been increasingly reported to be affected.