-11- 
I. The disease is likely to occur in host 
material as imported and cannot be detected 
by known, practicable inspection methods. 
II, The host material imported is so handled, 
distributed, and utilized as to make escape 
and establishment of the disease possible 
or probable. 
III. No practicable method of treatment is known 
which will eliminate the risk inherent in 
imported material, 
b. Probable cost of such a quarantine. 
2. Restrictive quarantine. 
a. Because adequate protection may be insured 
without prohibiting entry of host material. 
I. Detection of the disease in material as 
offered for entry is practicable. 
II. The material is consximed or processed in 
areas where the disease could not become 
established and practicable precautions will 
eliminate the risk. 
III. The material may be treated at the port of 
entry emd risk eliminated. 
IV. The disease is established in a contiguous 
country from which it will inevitably spread 
to this coxintry in a short time anyway so a 
restrictive quarantine to retard the spread 
and limit losses while control methods eire 
worked out is all that can be justified. 
b. Probable cost of such a quarantine. 
D. Consideration of possibility of entry of the disease. 
1. Natural barriers if any (ocean, desert, mountain, etc.). 
2. Possibility of other hosts. 
3. Possibility of alternate hosts. 
i^.. Possibility of insect carriers or vectors. 
5. Possibility of accidental distribution of imported 
material through carelessness, wrecks, high winds, 
unauthorized and non-intercepted imports of materials, 
etc. 
E. Possibiliiy of eradicating the disease if it became established. 
1. How does it live over from season to season? 
2. How readily is it spread? 
3. How long can it live in the absence of a host? 
i;. Is the host of such a nature that it may be eradicated 
readily from infected areas? 
5. How expensive would eradication be? 
