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Obstinate continuation of characteristic behavior, or of existence despite treatment or adverse environmental conditions.
[L. persisto, to abide, stand firm]


1. Obstinate continuation of characteristic behavior.
2. Survival despite opposition or adverse environmental conditions.
[L. persisto, to abide, stand firm]


the period of time between a virus being acquired by a VECTOR and its being transferred to a new host.

Patient discussion about persistence

Q. Have you ever heard that vaccines cause autism? If so why such thought persist? Hi my new friends! Hope you are all in good health! Have you ever heard that vaccines cause autism? If so why such thought persist? I look forward to reading all of your answers tomorrow.

A. Yes I heard about that and avoided being injected sometimes. This belief persists because signs of autism may appear around the same time that children receive the vaccine that prevents measles, mumps and rubella, and some parents worry that the vaccine caused the autism.

Q. Can lung cancer be diagnosed on behalf of persistent cough? My father is a heavy smoker. He smoked for all his adult life and he never stopped. In the last few weeks he started to have persistent cough attacks. Can those attacks be the first sign of lung cancer?

A. Smoking can damage the lung in many ways. The fact that someone that is a smoker is suffering from chronic cough doesn't mean that he is suffering from lung cancer. To get a cretin diagnosis you will have to do a chest X-ray.
here is a X-ray with the lesion that might be an actual lung cancer

Q. Headache that won’t go away. Help! Hi, I’m 47 years old man, working as accountant. Yesterday afternoon, I came back home, and after some time I started to feel headache that still going. Is it dangerous? Is it possible I have something like bleeding? I wasn’t hit or injured in anyway in my head before this headache appeared

A. There are two types of headaches: primary headaches and secondary headaches. Primary headaches are not associated with (caused by) other diseases. Examples of primary headaches are migraine headaches, tension headaches, and cluster headaches. Secondary headaches are caused by associated disease. The associated disease may be minor or serious and life threatening. Tension headaches are the most common type of primary headache. Tension headaches are more common among women than men. Migraine headaches are the second most common type of primary headache. Secondary headaches have diverse causes, ranging from serious and life threatening conditions such as brain tumors, strokes, meningitis, and subarachnoid hemorrhages to less serious but common conditions such as withdrawal from caffeine and discontinuation of analgesics. In any case if your headache continues you should see your doctor immediately. Hope this helps.

More discussions about persistence
References in periodicals archive ?
PerfectScreen program allows to resolve the issue of image persistence and to protect the monitor screen from damages.
If a significant number of firms adjust their prices based on past information, the country will face inflation persistence (Gali and Gertler (1999)) - the tendency of inflation to converge 'slowly' to its long-run level following a shock.
Almost all the adversities we witness in health care will continue in some fashion and our need for persistence endures.
Longer experience with the drug may ultimately alter its persistence rates.
Today, the only true persistence hunters are the Bushmen of Africa's Kalahari Desert.
But the importance of persistence of other symptoms is unknown.
On the other hand, several authors have sought to explain, by using business and industrial characteristics, the differences in firms' and industry's' persistence coefficients.
The empirical literature on profit persistence uses two different but interrelated definitions of persistence of profits.
Moreover, the timing of the change in inflation persistence suggests that the change may be a byproduct of a changing monetary policy environment.
If one wants to permanently lower inflation from its current level, less persistence implies that an output gap has to be opened for an even longer period of time than if persistence were higher.
It replicates and reinforces two earlier published, more modest applications of hardiness as an independent variable linked to the dependent variable of undergraduate persistence to timely graduation within four years.
Even top level professionals benefit from the fine art of persistence.