an water is a very worthwhile commodity; it can be obtained also by boiling water briefly, cooling it and then irrigating the cut, although usually that step is not necessary.  Boiling will kill everything and is more dependable method than filtering or any chemical additives.

Old Guyot mentions hanta virus as the major concern in the US.  I beg to differ.  HV is not present over many portions of the country. It is usually contracted by intimate contact with rodent feces, nesting material, etc.  Contagion is actually rather rare.

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