A stream flowing through a rural agricultural region in Central America contains 10–1 MPN/100ml of Giardia lambia cysts. If a backpacking tourist drinks 5 liters of water per day, how many days before the hiker is likely to become ill due to the salmonella contamination? Assume the typical infectious dose for Giardia in this community is 10 organisms.
What will be an ideal response?
Therefore, in 2 days hikers are likely to be exposed to 10 organisms.
You might also like to view...
?Plasticizer leaching or loss is an important consideration in terms of ____.
A. ?increasing opacity B. ?resistance to insects C. ?contact with food D. ?compatibility with resins
In reality, the cutting plane is infinite in size and, therefore, has no edges; but it is usually sketched as a finite size with edges so its ____________________ is shown.
Fill in the blank(s) with the appropriate word(s).
In hand-set multicomponent decks, joists normally _____.
a. are laid across the stringers b. are fabricated from aluminum c. support the stringers d. are spaced a minimum of 10' apart
If a component failure allows uncontrolled valve travel, ________ the valve at the power source
A) isolate B) discharge C) de-pressurize D) de-energize