Pertussis, also known as whooping cough, is a highly contagious respiratory disease. Below is a graph showing the prevalence of cases of pertussis in England and Wales. Answer ALL of the following questions based on the graph. 1) What do the orange and the green lines signify? 2) Make TWO inferences on the relationship between the orange and the green lines.  3)  Estimate within a 5-year span, the approximate time that a vaccine for pertussis became available.

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Respiratory Infections

Respiratory infections are infectious diseases of the respiratory tract that are mostly caused by bacteria and viruses. They cause infections of the throat, sinuses, airway path, and lungs. Respiratory infections are typically divided into two types: upper tract respiratory infection and lower tract respiratory infection.