I'd like to share my method I used for this game. I thought this game fell into the category of "sounds weird and looks weird, but is actually simple". This seems to be a pattern seen in the 4th game of many 70s.
A very simple way to look at this game would be to think of it as a sequencing game.
Ex. If it says A transferred to B, I would diagram it as A-B
If says A transferred it to 2 other computers, then I would think of the diagram as A connected to exactly 2 lines on the right.
For the rule "S transmitted...", I would have S with exactly ONE letter connected to the right (ie S-__). Also note, I could have something connected to the __ because that wouldn't be connected to S.
For the rule "..to R also .. S", this would be diagrammed as __-R with that same "__" connected as __-S. That should look like __ with 2 things to the right of it (those 2 things being R and S). Now combine this rule with the previous rule about S and your result should look like __ connected to R and connected to S. And S connected to exactly one other thing (don't know what yet).
At this point you might want to think about what could be the first __ that transfers a virus to R and S. Our remaining letters are P,Q,T,U. As for what S will transfer to will also be one of those 4 letters (at this point). Please also remember that each letter can only receive the virus once, meaning there is at most only one letter directly connected to left of a given letter.
Finally, we find out either R or T transmits to Q and either T or U transmits to P. This gives us a lot of information because now we can start to figure out what goes in each blank. By simply placing 1 letter that transfers to both R and S, almost everything else will trigger and fall into place.
I hope this helps simplify the virus game. If you're still a little confused, I can go into more details and break everything down.
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