11.   It causes intense headaches, fever, vomiting and stiff neck.

12.   It is characterized by sudden onset of intense headaches, fever, vomiting and a stiff neck.

13.   Its symptoms include stiff neck, fever, intense headache, nausea, vomiting and a purplish rash.

14.   She woke up the next morning with an intense headache that she mistook for a hangover.

15.   She woke up with an intense headache that she mistook for a hangover, Duffy told the AP.

16.   Symptoms include fever, vomiting, intense headache, and stiff neck.

17.   Symptoms include the sudden onset of fever, intense headache, stiff neck and nausea.

18.   Symptoms of the disease include high fever, intense headache, pain behind the eyes, backache, joint pains and an occasional rash.

19.   Their symptoms ranged from near blindness and deafness to intense headaches.

20.   Borne by the aedes aegypti mosquito, dengue fever causes intense headaches, vomiting, and muscle and joint aches.