Cold and fever is usually allowed to drink soup, but should be light soup.
When you have a cold and fever, you need to be properly hydrated, otherwise too much water loss from fever may cause dehydration, which is not favorable to the recovery of your condition. Therefore, you can drink more plain water or appropriate soup.
Therefore, drinking soup appropriately when you have a cold and fever may be beneficial to your body rather than contraindicated.
However, you should eat light food when you have a cold and fever, and you need to follow the above principles when drinking soup. Soup should not be too sweet, too salty, and also not too spicy or too greasy, or else it may adversely affect the condition.