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It's time for a flu shot.

You can get the flu vaccine from your doctor, and at public health facilities, senior centers, pharmacies and supermarkets. Adults over 50 are prime candidates for the vaccine because the flu can be fatal for older people.

There are two types of vaccines: the injection, which is approved for people older than 6 months, including healthy people and those with chronic medical conditions, and the nasal-spray, which is approved for use in healthy people 2-49 years of age who are not pregnant.

Q. Are there different forms of urinary incontinence?

There are several types of urinary incontinence:

Ÿ If urine leaks when you sneeze, cough, laugh or put pressure on the bladder in other ways, you have stress incontinence.

Ÿ When you can't hold urine, you have urge incontinence.

Ÿ When small amounts of urine leak from a bladder that is always full, you have overflow incontinence.

Ÿ Many seniors who have normal bladder control but have difficulty getting to the bathroom in time, have functional incontinence.

Q. Are probiotics safe?

There is debate over the precise definition of probiotics. The United Nations Food and Agriculture Organization and the World Health Organization call probiotics "live microorganisms, which, when administered in adequate amounts, confer a health benefit on the host."

Microorganisms or microbes are living organisms that can be seen only under a microscope. Microbes are everywhere; the human body contains billions of them.

Q. I seem to be getting sick a lot lately and I'm worried that my immune system isn't working right. Could that be a reason?

A diminished immune system could be the cause of your problems. Go to your doctor for a checkup and diagnosis.

The immune system is a network of cells, tissues, and organs that work together to defend the body against attacks by organisms such as bacteria, parasites, and fungi that can cause infections.

The cells that are part of this defense system are white blood cells, or leukocytes. Foreign substances that invade the body are called antigens.