In 1919 when the flu killed 40 million people, there was a Doctor who visited many farmers to see if he could help them combat the flu. Many of the farmers and their family had contracted it, and many died.
The doctor came upon one farmer, and to his surprise, everyone in the household was very healthy. When the doctor asked what the farmer was doing that was different, the wife replied that she had placed an unpeeled onion in a Dish in the rooms of the home (probably only two rooms back then). The doctor couldn't believe it and asked if he could have one of the onions and place it under the microscope. She gave him one, and when he did this, he did find the flu virus in the onion. It obviously absorbed the bacteria, therefore, keeping the family healthy.
Hope this tip is healthy for you all.