The reports available from various organisation such as CDC and WHO disproves the claim by stating no food, drink or supplement can fight COVID-19.
World Health Organisation and the British Nutrition Foundation states that healthy diets are important as nutrients will help support our immune systems and the ability to fight against any infections.
However, there is no evidence from the current outbreak which confirms that consuming milk can fight the coronavirus.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.