What are the nutrients most likely to be lacking in those who are malnourished? What are the consequences of those deficiencies?

The most common foodborne pathogen is Salmonella.
How does it enter the GI tract and what are the symptoms?

One of the most important things that we can do to protect ourselves is wash our hands. How long are you supposed to wash your hands with warm water and soap to reduce the chance of microbial contamination?