Impact Assessment of the Community Animal Health System in ...

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y the Office international des epizooties (OIE), using reporting forms developed by VSF Suisse and submitting them to the DVO each month. The system started in May 2009 and up to the end of July 2009 the CAHWs submitted seven disease outbreak reports. 3.4 Quality of CAHW treatments A summary of the impact of CAHW treatments on CFRs is presented in Table 2. Table 2. Statistical and clinical reductions in case fatality rates in livestock herds treated by CAHWs compared with owner‐treated herds Curative or supportive treatments by disease Sheep and goats Camels Cattle All species Statistical reduction in CFR Clinical reduction in CFR Statistical reduction in CFR Clinical reduction in CFR Statistical reduction in CFR Clinical reduction in CFR Statistical reduction in CFR Clinical reduction in CFR Curative: Helminthosis Mange Trypanosomosis CCPP CBPP Respiratory disease Tick‐borne disease Total Yes Yes ‐ Yes ‐ ‐ No Yes Yes ‐ Yes ‐ ‐ Yes Yes Yes No ‐ ‐ Yes ‐ Yes Yes Yes ‐ ‐ Yes ‐ Yes ‐ Yes ‐ Yes ‐ ‐ Yes ‐ Yes ‐ Yes ‐ ‐ 3/3 2/2 1/2 1/1 1/1 1/1 0/1 9/11 3/3 2/2 2/2 1/1 1/1 1/1 1/1 11/11 Supportive: Pox diseases PPR NSD FMD Paralysis, camels Total No No Yes ‐ ‐ Yes No Yes ‐ ‐ No ‐ ‐ ‐ No Yes ‐ ‐ ‐ Yes ‐ ‐ ‐ No ‐ ‐ ‐ ‐ No ‐ 0/2 0/1 1/1 0/1 0/1 1/6 2/2 0/1 1/1 0/1 1/1 4/6 Notes Curative treatments aim to kill the primary disease agent, such as a bacterium (e.g. through the use of antibiotic) or parasite (e.g. through the use of anthelmintic). For most infectious diseases curative treatment should result in lower CFRs (fewer deaths) than supportive treatments. Supportive treatments, in the context of this assessment, mainly involved the use of antibiotics to treat bacterial infections which were secondary to viral infections. This approach is used when anti‐viral drugs are not available and assumes that some deaths result from the secondary bacterial infections. As the primary cause of disease is not treated, in general, supportive treatments result in higher CFRs (more deaths) than curative treatments. Case fatality rates in sheep and goats CAHWs provided curative treatments for four diseases or disease groups viz. contagious caprine pleuronemonia (CCPP), mange, helminthosis and protozoal tick‐borne diseases, and supportive treatments for three diseases viz. Nairobi sheep disease (NSD), sheep and goat pox and peste des petits ruminants (PPR)(Table 3). For three out of four diseases where curative treatments were used by CAHWs, CFRs were significantly lower in CAHW‐treated cases relative to cases treated by livestock keepers. CAHWtreated cases of NSD also showed a significantly lower CFR relative to cases treated by livestock keepers. Furthermore, these median reductions in CFR were substantial: 31.6% for CCPP; 33.3% for mange; 21.4% for helminthosis and 33.9% for NSD. For tick‐borne disease, sheep and goat pox, and ‘other diseases’, CFRs were lower in CAHW‐treated herds. Compared with CFRs in owner‐treated 8
herds these changes were not statistically significant, but were clinically significant. For PPR (supportive treatment), CFRs were higher in CAHW‐treated herds. Table 3. Comparison of case fatality rates in sheep and goats following CAHW and owner treatments Disease CCPP CAHW treatments Median case fatality rate (%) 28.5 (n=84 flocks) Type of medicine and strategy a Oxytetracycline, curative Owner treatments Median case fatality rate (%) 63.4 (n=36 flocks) Type of medicine Tetracycline capsule Median difference in case fatality rates (%)(95% CI) 31.6 (20.5, 41.7)* Mange 4.9 (n=36 flocks) Ivermectin, curative 40.0 (n=11 flocks) Diazinon spray 33.3 (15.4, 47.6)* Tick borne disease b 37.9 (n=16 flocks) Oxytetracycline, curative 58.3 (n=6 flocks) Oxytetracycline 10.6 (‐27.5, 53.3) NSD 48.3 (n=36 flocks) Oxytetracycline, supportive 91.7 (n=14 flocks) Oxytetracycline 33.9 (16.0, 54.6)* Helminthosis 10.5 (n=29 flocks) Albendazole, curative 50.0 (n=11 flocks) Albendazole or tetramisole 21.4 (12.5, 50.0)* PPR 59.2 (n=50 flocks) Tylosin, supportive 42.9 (n=11 flocks) Dihydrostreptomycin tablets 4.6 (‐14.3, 26.7) Sheep and goat pox 23.9 (n=28 flocks) Oxytetracycline, supportive 34.9 (n=19 flocks) Not treated 11.1 (‐25.9, 2.6) Other c 19.3 (n=32 flocks) Various, supportive and curative 33.3 (n=15 flocks) Various 2.9 (‐31.9, 11.1) Notes * Significant at the 95% confidence level, using confidence interval analysis. a Supportive treatments used in viral infection and involved the use of antibiotic to treat secondary bacterial infections. b Assumed to be babesiosis or anaplasmosis. c Other diseases were footrot, lice infestation, botulism, bloat, ‘swollen head’ and non‐specific abortion. CCPP – contagious caprine pleuropneumonia; NSD – Nairobi sheep disease; PPR – peste des petits ruminants Case fatality rates in camels CAHWs provided curative treatments for five diseases or disease‐forms viz. acute trypanosomosis, chronic trypansomosis, respiratory disease (coughing), mange and helminthosis, and supportive treatments for one disease viz. camel pox (Table 4). For three out of five diseases where curative treatments were used by CAHWs, CFRs were significantly lower in CAHW‐treated cases relative to cases treated by livestock keepers. These median reductions in CFR were substantial: 25.0% for respiratory disease; 42.9% for mange; and 43.2% for helminthosis. For trypanosomosis (acute and chronic), camel pox, paralysis and ‘other’ diseases, CFRs were lower in CAHW‐treated herds. Compared with CFRs in owner‐treated herds these changes were not statistically significant, but were clinically significant. Case fatality rates in cattle CAHWs provided curative treatments for three diseases viz. trypanosomosis, contagious bovine pleuropnuemonia (CBPP) and helminthosis. For all three diseases there was a significantly lower CFR in CAHW‐treated herds relative to owner‐treated herds (Table 5). For ‘other’ diseases there was a lower CFR in CAHW‐treated herds which was clinically, but not statistically, significant. 9
Page 1 and 2: Impact Assessment of the Community
Page 3 and 4: Abbreviations CAH CAHW CBPP CCPP CF
Page 5 and 6: • CAHWs also provided supportive
Page 7 and 8: 1. Introduction 1.1 Private veterin
Page 9 and 10: 2.2 Data collection The data collec
Page 11 and 12: Within time and resource limits, th
Page 13: Figure 4. CAHW preferences for vete
Page 17 and 18: 3.5 Areas for improvement Table 6 d
Page 19 and 20: 4.2 Impact assessment findings The
Page 21 and 22: assessment agree with earlier studi
Page 23 and 24: With regards to the CAH disease rep
Page 25 and 26: diseases, NSD and PPR can all be pr
Page 27: Annex 2. Mortality and case fatalit

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