Hot water kills everything thought right?
Depends, Most people do not use boiling water, but just hot water (hot as in 50-60°C), and indeed some cooks say that you should never boil ramen. Typically, industrially prepared ramen is "cooked" with very much not boiling "hot" water (around 70-80°C top) for 3-4 minutes before being swallowed.
Hanta virus takes one hour at 60°C, about half that in 80°C, and rodent excrements are full of it. Lassa probably doesn't occur in your rodents (being more a west-Africa thing) but is similar.
Then there's Salmonella spp. which only need a modest 10 mins at 75°C. Streptobacillus moniliformis on the other hand takes 15 minutes at 121°C (moist) or 1 hour at 170°C (dry). At typical "soup temperatures", it'll survive for hours.