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If a tuberculosis infection does become active, it most commonly involves the lungs (in about 90% of cases). Symptoms may include chest pain and a prolonged cough producing sputum. About 25% of people may not have any symptoms (i.e. they remain "asymptomatic"). Occasionally, people may cough up blood in small amounts, and in very rare cases, the infection may erode into the pulmonary artery or a Rasmussen's aneurysm, resulting in massive bleeding. Tuberculosis may become a chronic illness and cause extensive scarring in the upper lobes of the lungs. The upper lung lobes are more frequently affected by tuberculosis than the lower ones. The reason for this difference is not clear. It may be due either to better air flow, or to poor lymph drainage within the upper lungs.

Which lobes of the lungs are more often affected by TB?
Answer: upper lung lobes
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The New York City Health and Hospitals Corporation (HHC) operates the public hospitals and clinics in New York City. A public benefit corporation with $6.7 billion in annual revenues, HHC is the largest municipal healthcare system in the United States serving 1.4 million patients, including more than 475,000 uninsured city residents. HHC was created in 1969 by the New York State Legislature as a public benefit corporation (Chapter 1016 of the Laws 1969). It is similar to a municipal agency but has a Board of Directors. HHC operates 11 acute care hospitals, five nursing homes, six diagnostic and treatment centers, and more than 70 community-based primary care sites, serving primarily the poor and working class. HHC's MetroPlus Health Plan is one of the New York area's largest providers of government-sponsored health insurance and is the plan of choice for nearly half million New Yorkers.

The largest municipal healthcare in the US is what?
Answer: New York City Health and Hospitals Corporation
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Current circulating in one antenna generally induces a voltage across the feedpoint of nearby antennas or antenna elements. The mathematics presented below are useful in analyzing the electrical behaviour of antenna arrays, where the properties of the individual array elements (such as half wave dipoles) are already known. If those elements were widely separated and driven in a certain amplitude and phase, then each would act independently as that element is known to. However, because of the mutual interaction between their electric and magnetic fields due to proximity, the currents in each element are not simply a function of the applied voltage (according to its driving point impedance), but depend on the currents in the other nearby elements. Note that this now is a near field phenomenon which could not be properly accounted for using the Friis transmission equation for instance.

What cause mutual interactions between the elements electric and magnetic fields?
Answer:
proximity