SPRINGFIELD, Mo. -- Greene County has seen a recent increase in tuberculosis cases.

The Springfield News-Leader reported Greene County typically has about three active cases of tuberculosis each year. The county is working on six TB cases now. Three of the cases were reported in the last couple of weeks.

Officials don't yet know what's caused the spike.

Clay Goddard, assistant director of health for the Springfield-Greene County Health Department, said it's unclear if the rising figure is a trend.

While TB has been mostly eradicated in the United States, it remains a massive problem globally. TB can spread through the air, even by an infected person just breathing in the same area. Symptoms include a violent cough, sometimes with blood, sudden unexplained weight loss, night sweats or darkened urine.

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Information from: Springfield News-Leader, http://www.news-leader.com