HOUSTON -

A Wharton County man diagnosed with West Nile virus has died, officials say.

The Wharton County Office of Emergency management said the man who died lived in El Campo and was in his 70s.

County officials said there may be a second person in the county with the virus, but test results are pending.

On Thursday, Fort Bend County said two of its residents have also been infected with the virus. One of the cases is in Sugar Land.

A spokesperson for the city of Sugar Land said it recently increased mosquito spraying and is working closely with the Texas Department of State Health Services to trap and test mosquitoes. The traps are in addition to the city's continued weekly mosquito spraying operations that take place every Friday evening. Additional spraying will be scheduled if necessary.

"It's very scary to hear there is a case nearby," said Dawn Bobbitt, a Fort Bend County resident. "What we've done recently is, we used to love sitting outside in our neighborhood, but we've stopped doing that. We're more cautious now."

Three Houstonians diagnosed with West Nile virus have died this year.

  • a northeast Houston woman between the ages of 55 and 74
  • a southwest Houston man between the ages of 55 and 74
  • a southwest Houston man between the ages of 75 and 84

Last year, the number of West Nile deaths in the city of Houston was zero.

There have been about 30 fatal cases in Texas in 2012.

Ten other Houstonians diagnosed with West Nile virus.

  • a northeast Houston woman between the ages of 35 and 44
  • a northwest Houston woman between the ages of 45 and 54
  • a northwest Houston woman between the ages of 55 and 74
  • a northwest Houston man between the ages of 55 and 74
  • a southeast Houston woman between the ages of 55 and 74
  • a southeast Houston woman between the ages of 45 and 54
  • a southwest Houston man between the ages of 45 and 54
  • a northwest Houston man between the ages of 75 and 84
  • a southwest Houston woman between the ages of 55 and 74
  • a southwest Houston woman between the ages of 55 and 74

Harris County has reported six human cases of West Nile virus.

Most people become infected within three to 10 days of a bite from an infected mosquito.

Symptoms include fever, headache, body tremors and visual problems.

Doctors said if you start to feel any of these things you should seek medical help right away.