Some people are at an increased risk of developing listeriosis, including: those over 60 years of age; pregnant women and their unborn babies; babies less than one month old and people with a weakened their immune system, such as those with HIV or on medication such as chemotherapy.
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Around 31 people are still thought to be missing after the boat sank on a reservoir near the city of Medellin.
Bins were set on fire and objects were thrown at officers as protesters demanded justice for the death of Edir Frederico Da Costa.
Patients are being left "belittled and bewildered" as medical staff try to deal with overstretched systems, the BMA will warn.