Description
Escherichia coli is a bacteria found in the environment, foods, and intestines of people and animals. It is large and diverse. Some E-coli's are harmless. Other types make you sick. They can cause diarrhea, respiratory illness, and pneumonia.
Source https://www.cdc.gov/ecoli/index.html
Symptoms
Some early signs and symptoms include nausea, vomiting, abdominal pain, fever, malaise, loss of appetite, and mild dehydration.
Source: https://www.medicinenet.com/e_coli__0157h7/articl e.htm
Whom does it affect?

Anyone can be infected with E-Coli. Young children, the Elderly and people with complicated immune system get affected the most by E-Coli.
How to prevent it
1.
Know your chances of getting food poisoned
2.
Proper Hygiene
3.
Wash fruits and vegetables well under running water
4.
Don't cause cross-contamination
5.
Avoid raw and unpasteurized milk or juice
6.
Don't swallow pool water
Source: https://www.cdc.gov/ecoli/ecoliprevention.html
How long after you get contaminated food do you get sick
It takes 3-4 days after you eat or drink something that contains E-Coli. You can become sick after 1 day to a week after you get exposed to it.

Source: https://www.mayoclinic.org/diseasesconditions/e-coli/symptoms-causes/syc-20372058