Idea of what MUTO really could be

Now i got the following idea of what MUTO and these creautures really could be.

MUTO is an organisation which treats some kind of idk desease caused by radioactive contamination. While they are trying to cure their pacients they could have produced a new serum which they are using on one patient, and later he mutates. Before knowing the consequences of that "serum" everyone gets a dosis of it and they start mutating into horrible spiderlike creatures called "mutos/mutoexperiments/muto creatures".

Since i saw that picture of the figure and someone said it looks like a human i got that idea.
Tell me what's your opinion of what all that MUTO stuff is ^^