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Prevalence of Heartworm per 1,000 dogs examined*
LAKE COUNTY
| Clear Lake/Clear Lake Oaks |
52 |
| Lakeport |
81 |
| Lower Lake |
28 |
| Middletown |
49 |
| Nice |
200 |
MENDOCINO COUNTY
NAPA COUNTY
SONOMA COUNTY
| Cloverdale |
95 |
| Healdsburg |
57 |
| Petaluma |
12 |
| Santa Rosa |
3 |
| Sebastapol |
9 |
| Sonoma |
22 |
* all dogs exposed to outdoors, no preventive meds, and no travel outside the
county
Source: "Canine Filariasis in California ", J.H. Theis, R.G. Schwab,
F. Stevens, C.E.
Franti, A.K. Chawla; Merck AgVet, div Merck & Co., St. Louis,
MO, 1995
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