Skip all navigation Skip to page navigation

DHHS Home | A-Z Site Map | Divisions | About Us | Contacts

NC Department of Health and Human Services
N.C. State Center for Health Statistics Home
N.C. Public Health Home
 
 

Tuberculosis in North Carolina, 1980-2009

Additional Information

Tuberculosis Control Program

The control of tuberculosis (TB) in North Carolina is managed under the coordination of the state TB Control Program, based in the General Communicable Disease Control Branch of the Division of Public Health, within the Department of Health and Human Services. In each local health department, at least one nurse is responsible for TB control activities in its area of jurisdiction (county, or district grouping several counties). Medical services are provided under contract locally with each local health department, with guidance from the medical director of the state TB Control Program. In addition, guidance is provided by the TB Medical Advisory Committee, composed of infectious disease specialists and pulmonologists from the major teaching medical centers in the state. Four regional tuberculosis nurse consultants cover the state providing expert advice, training and ensuring compliance with state and national guidelines. Under this program, drugs used to treat tuberculosis are provided free of charge.

In 1989, The Strategic Plan for the Elimination of TB in the United States called for the reduction of TB to 1 new case per 1,000,000 population by 2010. The interim goal was set at 3.5 new cases per 100,000 population by the year 2000. The target for Healthy People 2010 Objective 14-11 is now 1 new case per 100,000 population. A baseline of 6.8 new cases per 100,000 in 1998 was used to help set the target for this objective.

Technical Note

The animated maps showing the incidence of tuberculosis in North Carolina over a twenty-year period are based on the concept of moving averages. Moving averages have the effect of "smoothing" random fluctuations in annual incidence rates due to small numbers of cases and small county populations generating them. They are useful for showing general trends of rates over a period of time.

The moving average rates for the animated map were calculated by summing the number of cases from the current year, the two previous years and the next two years. The same process was used for state and individual county populations. The case sum was divided by the population sum and then multiplied by 100,000 to yield a five-year average incidence rate per 100,000 population. For more information about rates and their calculation please refer to the glossary. The results of these calculations are shown in the accompanying table. These rates are also depicted as part of the dynamic legend in the animated map. All rates for the maximum county column are based on twenty or more cases.

The rate classification scheme shown in the time series maps is based on equal numbers of counties in each of the four rate classes at the initial time period, labeled 1982. The values that demarcate the boundary between any two of the classes are held constant throughout the progression of maps. Over time, one can see that individual rate classes will shrink or expand with respect to the number of counties that they contain.

Incidence of Tuberculosis per 100,000 Population
Year US Annual1 NC Annual2 NC 5-Yr Ave.3 NC Max. 5-Yr Ave. County4
1980 12.3 18.1 - -
1981 11.9 16.5 - -
1982 11.0 13.4 14.6 60.9
1983 10.2 12.8 13.1 55.7
1984 9.4 12.3 12.1 54.0
1985 9.3 10.7 11.5 54.9
1986 9.4 11.4 10.9 51.6
1987 9.3 10.3 10.4 53.9
1988 9.1 10.0 10.3 57.3
1989 9.5 9.7 9.9 54.9
1990 10.3 10.0 9.5 45.6
1991 10.4 9.3 9.2 40.9
1992 10.5 8.8 8.8 35.1
1993 9.8 8.5 8.2 34.4
1994 9.4 8.0 7.9 31.3
1995 8.7 7.2 7.3 25.8
1996 8.0 7.6 6.9 23.9
1997 7.4 6.2 6.6 24.7
1998 6.8 6.6 6.3 23.9
1999 6.4 6.4 5.8 19.4
2000 5.8 5.8 5.6 22.7
2001 5.6 4.9 5.2 17.7
2002 5.2 5.4 4.9 17.5
2003 5.1 4.7 4.6 19.9
2004 4.9 4.5 4.4 31.0
2005 4.8 3.8 4.1 27.1
2006 4.6 4.2 4.0 26.4
2007 4.4 3.8 3.6 25.5
2008 4.2 3.6 - -
2009 3.8 2.7 - -

1. Data from the 1999 Surveillance Report by CDC NCHSTP Division of Tuberculosis Elimination

2. Data from N.C. Division of Public Health, General Communicable Disease Control Branch

3. Five-year moving average calculated by 5-year sum of TB cases ÷ 5-year sum of population × 100,000

4. The maximum county TB rate—all maximum rates are based on 20 or more cases