NTM在美國增加

老年婦女多(59%),平均66歲
而且症狀不太一樣
NTMthrive within the biofilm of municipal water systems and
likely infect susceptible hosts via aerosolization
最近遇到兩個NTM,一個是天天游泳的老人家,請他莫再游了
is it ok to check the swimming pool water supply?
MAC佔多,klaricid + EMB + Rif?

Atypical Mycobacterial Infections Might Be on the Rise

Pulmonary infections are now more common than pulmonary tuberculosis.

Pulmonary infections with "atypical" nontuberculous mycobacteria have been recognized for decades, but reliable estimates of their prevalence are elusive for several reasons: These infections are tricky to diagnose, geographically variable, and untracked by local or federal health departments. Several reports from around the country now suggest that infection rates are rising.

Investigators reviewed all clinical isolates of nontuberculous mycobacteria obtained from Oregon residents during 2005 and 2006. Estimated prevalence of pulmonary infection was 8 to 11 cases per 100,000, with a prevalence in older people (age, ≥50) of about 26 per 100,000 (considerably higher than estimated rates from the 1980s). The incidence of tuberculosis (TB), by contrast, was 7 per 100,000 in that age group during the study period. Among 184 patients with confirmed disease, 59% were women or girls; about half the women and girls had either bronchiectasis or immunosuppressive treatment as a risk factor, whereas only 22% had the classic risk factor of chronic obstructive pulmonary disease.

In a similar but larger study, investigators analyzed isolates of atypical mycobacteria obtained from patients in four large healthcare systems in California, Colorado, Pennsylvania, and Washington State from 2004 through 2006. Estimated disease prevalence ranged from 1 to 6 cases per 100,000, with higher rates in women and older people (age, ≥60); prevalence rose slightly in most age groups during the 3 years of the study. In this study as well, the overall prevalence of infections with atypical mycobacteria considerably exceeded that of pulmonary TB at all study sites.

Comment: Interestingly, these findings indicate that atypical mycobacterial infections now outrank TB in the U.S. (and are probably absorbing a considerable fraction of the public health resources intended for TB control). Are these infections really on the rise, fueled by immunosuppressive drugs or environmental factors? Or, are we just identifying them more often? Presumably more detailed and comprehensive information will be forthcoming.

— Abigail Zuger, MD

Published in Journal Watch General Medicine October 21, 2010
Citation(s):

Winthrop KL et al. Pulmonary nontuberculous mycobacterial disease prevalence and clinical features: An emerging public health disease. Am J Respir Crit Care Med 2010 Oct 1; 182:977. (http://dx.doi.org/10.1164/rccm.201003-0503OC)

* Original article (Subscription may be required)
* Medline abstract (Free)

Prevots DR et al. Nontuberculous mycobacterial lung disease prevalence at four integrated health care delivery systems. Am J Respir Crit Care Med 2010 Oct 1; 182:970. (http://dx.doi.org/10.1164/rccm.201002-0310OC)

* Original article (Subscription may be required)
* Medline abstract (Free)

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