Many people believe that it is unnecessary to wash fruit whose bark you do not eat, but research has now shown that this is not the case with avocados.
The US Food and Drug Administration (FDA) conducted the study and published a finding that avocados can contain bacteria such as listeria and salmonella.
The study tested 1615 avocados, of which 17 percent were positive for listeria, and one percent was contaminated with salmonella. However, in the fruit itself, only three of 1254 were positive for listeria.
Despite low figures, the FDA warns that when cutting avocados, there is little risk of contamination of the fleshy part of the fruit with the bacteria on the bark.
The recommendation is to wash your hands for at least 20 seconds before handling fresh fruit and vegetables, as well as wash the foods themselves under a jet of water.
Fruits like avocados can be scrubbed and wrapped with a clean paper napkin afterwards to make sure all bacteria are removed.