Saline nose sprays are great, btw - they keep your nose clear of debris, mucus and mechanically remove lots of dust and pollen.
Most Ear-nose-throat docs recommend them to their patients who suffer from frequent sinus infections.
As far as garlic, it is a natural antiviral, it is correct, there is nothing wrong with eating lots and lots of it.
So , Gulya, your friend has all the good remedies:-D .
Other preventives are - washing hands, multivitamins with lots of C and D, omega -3 -fatty acid, Goldenseal, Elderberry extract, lots of fluids, plenty of sleep and avoiding shopping malls at times of flu activity.
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Happy New Year to all! Virtual hugs!