On March 23, 2011, VOA issued article titled “US Developing Radiation Sickness Drug” which covered topic on serious radiation leaks at Japan's damaged Fukushima and how researchers are working on antidotes for radiation exposure.

Interesting to note was report that Col. Andrew Huff, a spokesman for the research institute explained :

“The symptoms of acute radiation sickness will be just exactly like a terrible flu,"

"The person would have headache. They would feel very tired. They would have little bit of fever. They might have some vomiting at higher doses all of this and more but at survivable doses it would come on within 24 to 36 hours."

 Read full article on link below :

https://www.voanews.com/a/us-deveoping-radiation-sickness-drug-118575759/167245.html 

In connection to exposure to radiation and flu like symptoms following study have more to confirm :

Evidence for a connection between coronavirus disease-19 and exposure to radiofrequency radiation from wireless communications including 5G

Study on link below :

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8580522/