Shaking chills are a symptom of Pneumonia.

Pneumococcal pneumonia may begin suddenly, with a severe shaking chill usually followed by High fever, Cough, Shortness of breath, Rapid breathing, and Chest pains. Pneumonia should be treated aggressively, so that it does not give rise to serious lung complications. If you have severe shaking chills, you can assume you have more than a cold!

There may be other symptoms as well
* Nausea
* Vomiting
* Headache
* Tiredness
* Muscle aches

Medicare will pay for a pneumonia vaccination.