Now you can have flu virus in the region and we also have it activated, however, as it can and in any place. In my experience, I know that a cold shower certainly strengthens immunity and it's great that you take it, but in your case it was not enough, because you already have a virus in your family and most likely you were already infected. In such cases, I usually take antibiotics and the disease gradually recedes. Thank you @humanearl and speedy recovery to you and your family!