K H O A H O C K Y THUAT T H U Y TAP XVIIl - S O 4 - 2 0 1 1
TINH HINH THAI TRLf SALMONELLA THEO PHAN 6 LON NUOI TAI CO S6 CHAN NUOI TAP TRUNG TREN MOT SO
TJNH MIEN BAC VIET NAM
Dang Xuan Binh, Nguyin Thi Nguyet TrUdng Dai hoc ndng Mm Thii Nguyin T O M TAT
Khao sat thai trif Salmonella tif m l u phan Ipn nai sinh san, Ipn con sau cai sifa khdng bidu hifn trifu chiing Idm sang va Ipn m i c bfnh phd thudng ban d cac trang trai chan nudi Ipn theo hinh thiic cdng nghifp tap trung tai Cao Blng, Thai Nguydn va Ha l a y eii n h l m muc dich xac dinh tin sua't phan bd serotyp. Kd't qua eho tha'y:
Da xac dinh tinh hinh thai trif Salmonella typhimurium tii Ipn nai sinh san tai Thai Nguydn cd 3 chung; Ha Tay cd 2 chiing va Cao Blng cd 1 chung; ddi vdi Salmonella choleraesuis tai Thai Nguydn ed 6 chung. Ha Tdy cd 7 chiing va Cao Blng ed 4 chung; edn Salmonella enteritidis d ldn nai tai Thai Nguyen ed 2 chiing. Ha Tdy khdng cd chiing nao va Cao Blng ed 1 chiing.
Lpn con sau eai siia m i c bfnh phd thudng ban do Salmonella typhimurium va Salmonella choleraesuis. Khdng phan lap dupe Salmonella enteritidis tif lpn mle bfnh.
Tii khoa: Lpn, Salmonella, Thai tarii. Mien blc Vift Nam
Salmonella excretion by the fecal route in pig farms in North Vietnam
Dang Xuan Binh, Nguyen Thj Nguy#t SUMMARY
Salmonella excretion by reproductive sows, weaned piglets without clinical symptoms and paratyphoid infected pigs in farms raised in the industiial form in Cao Bang, Thai Nguyen and Ha Tay provinces was studied to the purpose of determining the serotype frequency distribution. The results showed that:
Regarding the 5. typhimurium, 3 isolates were obtained in Thai Nguyen, 2 in Ha Tay and 1 in Cao Bang. Also, regardmg S. cholerasuis, 6 isolates were obtained in Thai Nguyen, 7 in Ha Tay and 4 in Cao Bang and as well as 5. enteritidis, 2 isolates from Thai Nguyen, none from Ha Tay and 1 from Cao Bang.
Weaned pigs were found infected by 5. typhimurium paratyphoid and 5. choleraesuis whi\e S. enteritidis Vf as not isolated from infected pigs.
Key words: Swine, Salmonella, Excretion, North Vietaam
I. DAT VAN D E ciiu vi nhifng v l h d l dich t l nghidm trpng cd
• Vi khua'n SalmoneUa dupe Salmon va tinh chit toan c l u (Cheng Hsun Chiu el al.
Smith phan lap l l n d i u tien d lpn vao nam 2004)[3] „ u s ^A 1886 (Schwartz KJ, 2006)[8], vi khua'n eU trii Co the nhan thay. Salmonella r^^^tr^n trong dudng rudt eda c l ddng vat mau ndng Ic'n ndi chung - hen quan ddn hai van de va mau lanS. Vdi sd' lUdng len den tren 2000 thii nhat la tac nhan gay bfnh eho lpn, va thU serotyp khac nhau, Sahnonella dupe xac dinh hai la gay - g j ^ f ^ , ' ^ ; ^ ^ , ^ f ^ (<*^'J^' ""^^ ' ^ gay 7a nhilu the'bfnh cho ngudi va ddng vat. pham dupe che bien hf lpn) cho ngUdi.
Lae dix da dUdc nghien ciiu tif tren 100 nam, Tien hanh nghien cUu, xac d m h v i khudn nhung de'n nay beiSi nhilm khua'n SalmoneUa Salmonella nhiem hdn ldn nai smh san, lpn Tn^vrdi va ddng vdt v i n tid'p hfc dupe nghidn con sau eai sua khde va lpn bi bfnh tieu chay
KHOA HOC KY THUAT THU Y TAP XVIII - SO 4 - 2011
de' bd' sung tu lifu khoa hoc v l sU lifu hardi cua yl'u td bfnh nguydn, t^ dd mcl ra hudng nghidn ciiu mdi va d l xua't bidn phap khd'ng chd' hifu qua tinh trang mang va thai trif Salmonella or lpn.
IL NGUYEN L I E U VA P H U d N G P H A P NGHIEN c u t !
2.1. Nguyfn lifu
Mau phan lpn nai sinh san, lpn eon sau cai sUa khde (khdng bidu hifn trifu chiing Idm sang) va lpn con sau cai siia m l e bfnh phd thuong ban (Salmonellosis) dd xae dinh thai trif Salmonella sp..
Hda chat, mdi trudng thdng dung trong nghidn ciiu vi khuan hpe; huyd't thanh hoc;
cac phudng phap nghidn cihi thudng quy da dupe chuan hda.
2.2. Phirotig phap
Thu thap m l u phan b l n g tampon vd trimg ngoay true trang lpn thi nghifm hoac la'y phan mdi thai.
Phan lap va giam dinh d | c tinh sinh vat hda hpe eua vi k h u ^ Salmonella theo Quinn.P.J et al (1994)[6] va tidu ehua'n Qud'c te' Global Salm-Surv (2003)[4].
Xac djnh khang nguydn thdn (O) v4 khang nguydn Idng (H) eiia vi k h u ^ Salmonella phan lap dupe bang phan iing huyd't thanh hpe thu kha nang ngUng ke't giifa khang nguyen nghi ngd va bp khang huyet thanh chuan ciia Difco Laboratories (DIFCO Sahnonella O Antiserum va DIFCO Salmonella H Antiserum)
H I . K E T QUA N G H I E N CUtJ VA THAO LUAN
3.1. Khao sat thai trii Salmonella 0 ldn nai sinh san
Ti6i hanh khao sat thai trif Salmonella sp. ol lpn nai sinh san tai mdt sd cd s^ chan nudi lpn, ke't qua dupe trinh bay oi bang 1,2.
Bing 1. Thii trtt Salmonella sp. dlUn nil sinh sin theo din vi theo ci thi
£)ja phu'ong
Thai Nguyen
Ha Tdy
Cao Bang
Trai chan nudi TL TT TH PL
se
DC
Thai trii Salmonella theo dan So dan
k\em tra 16 11 18 20 19 23
So dan du-cng tfnh
13 10 17 18 16 14
T y l f (%) 81,2 90,9 94,4 90,0 84,2 60,8
Thai trir Salmonella theo ca the Sdlpn
kilm tra 128
96 115 137 152 220
So Ipn duang tinh
48 42 51 63 79 68
Tylf (%) 37,5 43,7 44,3 45,9 51,9 30,9 Tut bang 1, eac kd't qua cho tha'y: Tai Thai
Nguydn khao sat 2 trai chan nudi , thai trif Salmonella sp. c) lpn nai khao sat theo dan chid'm ty If hf 81,2% ddn 90,9%, theo ca thd' tif 37,5% ddh 43,7%; tai Ha Tdy khao sat 3 hai chan nudi ty If hfdng iing la 84,2% - 94,4% va 44,3%- 51,9%; tai Cao Blng khao sat 1 hrai lpn sinh san, ty If brdn la 60,8% va 30,9%.
Qua bang 1 da p h a n anh miic dd thai trut
Salmonella d lpn nai sinh san ehSn nudi theo hinh thife cdng nghifp tap trung, ddng thdi chi rd yd'u td' nguy cd gdy bfnh phd thUdng han d ldn eon sau cai sifa va gay ngd ddc thuc pha'm cho ngudi khi suf d u n g san pham chd' bid'n tif lpn khdng bao d a m vf sinh thii y. Kd't qua nay p h u h d p vdi Peter Davies (1998) [5], Andrijana Rajic, Juia Keenliside (2001) [1].
KHOA HOC KY THUAT THU Y TAP XVIIl SO 4 - 2011
pac
thang kilm
tra
1 2 3 4 5 6 7 8 9 10 11 12
Bing 2. Thii trit Salmonella sp. dlan nil sinh sin theo cic thing trong nim Dja diem khao sat thai tni Salmonella d Ipn nai sinh san
Thai Nguyen So Ipn
theo doi (con)
20 20 19 19 19 19 18 18 18 18 18 18
So Ipn du'ong tinh (con)
4 5 6 9 9 11 10 9 8 7 6 6
T y l f (%)
20,0 25,0 31,5 47,3 47,3 57,8 55,5 50,0 44,4 38,8 33,3 33,3
HaTay So Ipn
theo ddi (con)
35 35 34 34 34 34 34 33 33 33 33 32
Sd Ipn duang tinh (con)
13 14 15 18 18 20 19 19 17 15 13 12
T y l f (%)
37,1 40,0 44,1 52,9 52,9 58,8 55,8 57,5 51,5 45,4 39,3 37,5
Cao Bang So lan
theo doi (con)
19 19 19 19 18 18 18 18 18 18 18 18
Sd Ipn du-ang tinh (con)
3 5 5 8 9 9 7 6 5 4 4 3
T y l f (%)
15,7 26,3 26,3 42,1 50,0 50,0 38,8 33.3 27,7 22,2 22,2 16,6 Tif bang 2, cac kd't qua cho tha'y: Tai Thai ty If tudng iing tif 37,1% (thang 1) dd'n 58,8%
Nguydn, lpn nai thai trif Salmonella ed sif bid'n (thang 6). Tai Cao Blng, ty If thai trif tha'p ddng theo thang, tif 20,0% dd'n 57,8%; tap nha't vao thang 1 (15,7%) va cao nha't vao hung vao cac thang 4 dd'n thang 8. Tai Ha Tay thang 5 (50%).
60- 50-
^' 40-
•fD>
2 30-
20- 10-
r ' 1
1
1 2 3 4 5 61 1 1 H J
r
1 r 1 M
7 8 9 10 11 12
• Thai Nguydn
• Ha Tay
• Cao Bang
Thdng
Biiu dd'so sinh mtic do thii trii Salmonella theo phin lun nil sinh sin tai Thii Nguyin, Ha Tiy va Cao Bing
KHOA HOC KY THUAT THU Y TAP XVlll - SO 4 - 2011
3.2. Thai trii Salmonella sp. va tinh hinh bfnh phd thUdng han d Idn con sau cai siia
Tie'p tue khao sat thai trif Salmonella h lpn eon sau eai sifa khdng bie'u hifn trifu chiing lam sang; tinh hinh bfnh phd thudng ban va thai trif Salmonella h lpn m l e bfnh tai eac cd s^ chan nudi trong khudn khd ciia
bay h bang 3, 4 va 5.
3.2.1. Thai trif Salmonella sp. d Idn sau cai sua khdng co trifu chiing lam sang
Tie'n hanh khao sat thai trif Salmonella d lpn con sau cai suta khdng cd bidu hifn trifu chiing Idm sang cua bfnh phd thUdng ban, ke't nghien ciiu nay, cae ke't qua t h u d u p e trinh qua dupc brinh bay oi bang 3.
Bing 3. Thii trA Salmonella sp. 6 lan con sau cai sUa khong biiu hiin lim sing
Dja phuang Thai Nguyen
Ha Tdy
Cao Bang
Trai chan
nudi TL TT TH PL SD DC
Thai tru Salmonella theo dan So dan
kiem tra 12 11 13 12 13 16
So dan duang tinh
2 2 2 3 3 2
T y l f (%) 16,6 18,1 15,3 25,0 23,0 12,5
Thai tru Salmonella theo ca the So Ipn
kiem tra 213 198 231 206 229 284
So lpn duang tinh
6 3 3 5 3 3
Tylf (%) 2,8 1,5 1,2 2,4 1,3 1,0 Tif bang 3 cho tha'y lpn sau cai siia khdng
bie'u hifn trifu chiing lam sang ed mang va thai trif Salmonella qua phan. Tai Thai Nguyen ty If thai trif Salmonella b lpn khao sat tiieo dan chie'm tii 16,6% deii 18,1%; tai Ha Tay chie'm tii 15,3% dfh 25,0%; tai Cao Blng chie'm 12,5%. Ke't qua nay phii hdp vdi Robin C et al (2000)[7], Sehwartz.K.J (2006)[8], ddng thdi giai thich eho ke't qua khao sat thai ttvL
Salmonella h lpn nai sinh san tai eac dia phudng trinh bay tai bang 1 va 2.
3.2.2. Tinh hinh b f n h pho thUdng han d ldn con sau cai siia tai Thai Nguydn, Ha TSy va Cao Bang
Tie'n hanh d i i u tra tinh hinh bfnh phd thudng han cl lpn eon sau cai siia tai eac cd sol chan nudi, ke't qua dupe trinh bay d baiig 4.
Bing 4. Tinh hinh binh phd thucfnghan dlUn con sau cai sUa
Dja phuang
Thai Nguyen
Ha Tay
Cao Blng
Trai chan
nudi TL TT TH PL SD DC
Lpn mac bfnh theo dan Sddan
kilm tra 12 11 13 12 13 16
So dan m i c bfnh
3 4 4 5 5 3
T y l f (%) 25,0 36.3 30,7 41,6 38,4 18.7
Lpn mac bfnh theo ca the So Ipn
kiem tra 213 198 231 206 229 284
So Ipn mac bfnh
12 11 14 16 20 13
Tylf {%) 5.6 5,5 6.0 7,7 8.7 4.5
KHOA HOC KY THUAT THU Y TAP XVIII - SO 4 - 2011
Tif bang 4 cho tha'y lpn eon sau cai siia mle bfnh phd thudng han va cd su khac giiia eac dia phudng (P<0,05); ty If ldn m i c bfnh tai Thai Nguyen chie'm tii 5,5% deh 5,6%; tai Ha Tay chie'm tit 6,0% de'n 8,7%; tai Cao Blng chie'm 4,5%. Ke't qua nay phu hdp vdi Sehwartz.K.J (2006)[8], ddng thdi giai thich cho kit qua khao sat thai trif Salmonella d lpn
Bing 5. Kit qui phin lip Salmonella
con sau eai siia khdng ed bie'u hifn lam sang trinh bay tai bang 3.
3.2,3. Phan lap Salmonella sp. tit lan con sau cai sira bi benh pho thirffng han tai
Thdi Nguyen, Ha lay vd Cao Bdng
Da thu thap m l u phan lpn con sau eai sua mle bfnh phd thudng ban de' phan lap Salmonella, ke't qua dupe trinh bay d bang 5.
sp. tiilUn mic binh phd thuunghan
Dja phuang
Thai Nguyen
HaTay
Cao Blng
Trai chan nudi TL TT TH PL SO DC
Ket qua phan lap Salmonella tu miu phan Sd mau kiem tra
12 11 14 16 20 13
So miu duang tinh 9
8 11 10 15 10
Ty le(%) 75,0 72,7 78,5 62,5 75,0 76,9 Tif bang 5, ke't qua thu dupe eho tha'y: Da
phan lap dupe Salmonella tix phan lpn sau eai sifa mle bfnh phd thUdng ban. Ty If phan lap dupe tai Thai Nguyen tif 72,7% deh 75,0%; tai Ha Tay tit 62,5% de'n 78,5%; tai Cao Blng 76,9%. Ke't qua nay p h u hpp vdi Cheng Hsun
Chiu et al (2005)[3], Sehwartz.K.J (2006)[8].
3.3. Giam dinh mdt sd' dSc tinh sinh vit hda hpe chiing Salmonella phSn lap
Tie'n hanh giam dinh mdt sd' dac tinh sinh vat, hda hpe eiia cac chiing Salmonella phan lap, ke't qua dupc trinh bay d bang 6.
Bing 6. Mdt sd'die tirdi sinh vithoa hoc cua chung Salmonella phin lip
STT 1 2 3 4 5 6 7 8 9
Dac tinh giam djnh Nhudm Gram Ldn men lactose Ldn men D-glucose Ldn nien D-sorbitol Simmons Citrate San sinh H2S San sinh Indole Phan ling catalase Phdn ling oxidase
Salmonella phan lap tai Thai Nguyen n
36 36 36 36 36 36 36 36 36
+/- Gr-
•¥
+
-f
•¥
•¥
% 100
0 100 100 100 100 0 100
0
Salmonella phdn lap tai HaTay n
57 57 57 57 57 57 57 57 57
+/- Gr-
+ + + +
+
% 100
0 100 100 100 100 0 100
0
Salmonella phan lap tai Cao Blng n
23 23 23 23 23 23 23 23 23
+/- Gr-
+ + + +
+
% 100
0 100 100 100 100 0 100
0 Ghi chu: n:Sefchung giim dinh; +/-: DucOig tinh hay Am tinh; %: Ty 16 phin trim
KHOA HOC KY THUAT THU Y TAP XVIII-SO 4 2011
Tai Thai Nguydn da chpn 10 chiing Salmonella phdn lap tif lpn nai sinh san, 9 chiing tif lpn sau eai sifa khdng bidu hifn Idm sang va 17 chiing phan lap tif lpn m l e bfnh phd thudng han (36 chiing); tai Ha Tay chpn 10 chiing phdn lap tif lpn nai sinh san, 11 chiing tif lpn sau eai siia khdng bieu hifn lam sang va 36 chiing tif lpn mac bfnh phd thudng ban (57 chiing); Tai Cao Bang chpn 10 chiing tif lpn nai sinh san, 3 chiing tif lpn sau eai sifa khdng bidu hifn Idm sang va 10 chiing tif ldn mac bfnh phd thUdng han (23 chiing).
Tif bang 6, eac kd't qua eho tha'y: Cac chung Salmonella phan lap cd cac dac tinh sinh vft hda hpe dac tnfng, didn hinh n h u md ta trong eac tai lifu kinh di^n. Kd't qua phii hdp vdi Quinn.P.J etal(1994)[6].
3.4. Tinh man cam khang sinh cua cac chung Salmonella sp. p h i n lap tii ldn con sau cai sifa bi benh phd thUdng han
Tie'n hanh thif tinh m i n cam vdi mdt sd loai khang sinh eiia Salmonella phan lap tif lpn eon sau cai siia bi bfnh phd thUdng ban, kd't qua trinh bay d bang 7.
Bing 7. Tinh min cim khing sinh ciia Salmonella phin lip tttlcfn con sau caisSa bi binh phd thUUnghin
Loai khang sinh
& hda dupc
Ceftazidime Colistih Gentamicin Kanamycin Neomycin Norfloxacin Spectinomicin Nalidixic acid Oxytetracycline Trimethoprim
Danh gia miic dp min cam khang sinh cua chung Salmonella phin lap (%) Thai Nguyen (n=36)
Manh 87,2 73,6 65,7 53,6 63,9 78,5 63,9 90,3 89,3 77,6
Trung binh 12,8 12,8 8,2 21,8 19,3 6,8 21,7
9,7 10,7 14,8
Khang 0 13,6 26,1 24,6 16,8 14,7 14,4 0 0 7,6
Ha Tay (n=57) Manh
90,3 69,5 54,8 61,3 59,8 82,1 71,4 87,6 93,4 80,3
Trung binh
9,7 23,1 13,7 16,9 26,1 11,4 19,2 12,4 6,6 11,2
Khang 0 7,4 31,5 21,8 14,1 6,5 9,4 0 0 8,5
Cao Bang (n=23) Manh
96,1 57,9 72,8 57,2 70,5 68,6 57,8 92,7 91,6 83,6
Trung binh
3,9 30,6 11,6 18,6 21,4 30,2 23,7 7,3 8,4 9,8
Khang 0 11,5 15,6 24,2 8,1 1,2 18,5
0 0 6,6 Tu: bang 7, kd't qua thu dupc cho thd'y cae
chiing Salmonella phan lap d i u m i n cam manh vdi khang sinh Ceftazidime tif 87,2%
(Thai Nguydn) den 96,1% (Cao Blng); dd'i vdi Nalidixic acid ty If m i n cam dat tif 87,6% (Ha Tay), de'n 92,7% (Cao Blng); vdi Oxytehracyeline ty If bren tif 89,3% (Thai Nguyen), dd'n 93,4% (Ha Tdy). Kd't qua nay
phu hpp vdi Boris Habrun et al (2010) [2].
3.5. Doc luc cua chung Salmonella sp. phan lap tli Idn sau cai siia m i c bfnh pho thUdng han
Tid'n hanh thuf ddc life eiia chiing Salmonella phan lap tif ldn eon sau cai sifa mle bfnh phd thUdng han, kd't qua dUde trinh bay ol bang 8.
KHOA HOC KY THUAT THU Y TAP XVIII - SO 4 - 2011
Bing 8, Ddc Ittc cua chung Salmonella sp. phin lip tit lan sau cai sUa mic binh phd thuang han
Dja phuang
Thai Nguyen
HaTay
Cao Blng Trai chan
nudi TL TT TH PL SO DC
So lupng chung
9 8 11 10 15 10
S6 chupt
thu (con)
18 16 22 20 30 20
Lilu tiem xoang
bgng (ml/con)
0,2 0,2 0,2 0,2 0,2 0,2
Thdi gian theo ddi sau khi gay nhiem va sd chupt thi nghifm chet
(gid)
<12 3 2 2 3 5 2
13-24 9 5 12
9 13 11
>24-48 4 1 6 5 8 5
>48-72 1 0 0 2 3 0
>72 0 0 0 0 0 0
Tyjf ehdt (%) 94,4
100 90,9 95,0 90,0 85,0 Tif bang 8, eac ke't qua thu dupc cho thay
cae chiing Salmonella phan lap cd ddc luc manh gay chft chudt thi nghifm sau khi gay nhilm, cu the': Salmonella phan lap tai Thai Nguyen gay che't tii 94,4% deh 100% chudt thi nghifm trong vdng 72 gid sau khi gay nhilm;
cae chung Salmonella Ha Tdy gay che't tif 90,0% de'n 95,0% va eac chiing Salmonella Cao Blng gay che't 85,0% chudt thi nghifm.
3.6. Giam dinh serotjrp cua cac chung Salmonella
phan lap
Da tie'n hanh giam dinh serotyp ciia cac chiing Salmonella phan Ifp tif lpn nai sinh san, ldn eon sau eai sua khdng bieu hifn lam sang va lpn mic bfnh phd thudng ban sU dung bd khang huye't thanh ciia hang Difco:
Khang huye't thanh O (DIFCO Salmonella O Antiserum) va khang huye't thanh H (DIFCO Salmonella H Antiserum). Ke't qua trinh bay tai bang 9.
Nhom huyit thanh
Bing
Sserotyp
Salmonella H (Flagellar) Polyvalent Antiserum (A, B, C, D)
Salmonella 0 (Somatic) Polyvalent Antiserum (A, B, C, D)
B Cl 01
SaL typhimurium
SaL choleraesuis
SaL enteritidis
9. Giim dinh serotyp chung Salmonella phin lip
Dja diem va doi tupng phan lap Salmonella Thai Nguyen (n=29)
Lpn nai
10
10
3 6 2
Lpn con khde
9
9
2 4 0
Lan con mac PTH 10
10
1 5 0
HaTay(n=31) Lpn
nai 10
10
2 7 0
Lan con khde
11
11
2 4 0
Lpn con mac PTH 10
10
1 6 0
Cao Bang (n=23) Lan
nai 10
10
1 4 1
Lpn con khde
3
3
2 6 0
Lpn con mic PTH 10
10
1 5 0 Ghi chu: PTH: Pho thudng han; Sal: Salmonella
KHOA HOC KY THUAT THU Y TAP XVIII SO 4 - 2 0 1 1
Tuf bang 9, cac kd't qua cho thaiy: Cae chiing Salmonella phdn lap d i u cho phan iing ngifng kd't dUdng tinh, dat ty If 100% vdi nhdm khang huye't thanh da gia O va H.
Da phat hifn lpn nai sinh san thai trif Salmonella typhimurium, tai Thai Nguydn cd 3 chiing; Ha Tdy ed 2 chiing va Cao Blng cd 1 chung; thai trif Salmonella choleraesuis s6 \i^u tudng ling la 6 , 7 chiing va 4 chiing; thai truf Salmonella enteritidis d ldn nai tai Thai Nguydn cd 2 chiing. Ha Tdy khdng cd va Cao Blng ed 1 chiing.
Lpn mac bdnh phd thudng ban da xae dinh do Salmonella typhimurium va Salmonella choleraesuis, khdng ed Salmonella enteritidis.
Kd't qua nay phu hpp vdi Sehwartz.K.J (2006)[8].
IV.KET LUAN
Thai tru: Salmonella 6 lpn nai khao sat theo dan tai Thai Nguydn chid'm ty If tif 81,2%
de'n 90,9%, theo ca thd' tuf 37,5% dd'n 43,7%; tai Ha Tdy ty If hfdng iing la 84,2% - 94,4% va 44,3% - 51,9%; tai Cao Blng la 60,8% va 30,9%.
Lpn nai thai trif Salmonella cd su bid'n ddng ttieo thang, tai Thai Nguydn tif 20,0%
57,8%, tdp trung cao vao cac thang 4 ddh thang 8. Tai Ha Tdy, ty If h'dn tii 37,1% (thang 1) deh 58,8% (thang 6). Tai Cao Bang, ty If thai tha'p nha't vao thang 1 (15,7%) va cao nha't vao thang 5 (50%).
Lpn sau eai siia khdng bieu hifn trifu chiing lam sang ed mang va thai trif Salmonella qua phan. Ty If thai tru: theo dan chie'm tii 12,5% de'n 25,0%.
- Ldn con sau cai siia m l e bfnh phd thudng ban 4,5% deh 8,7%.
Ty If phan lap Salmonella tif lpn mle bfnh phd thUdng ban tai Thai Nguydn chid'm tu: 62,5% dd'n 78,5%.
Salmonella phdn lap m i n cam manh vdi khang sinh Ceftazidime dat 87,2% dd'n 96,1%;
m i n cam vdi Nalidixic acid dat 87,6%
92,7%; m i n cam vdi Oxytetracycline dat 89,3%- 93,4%
- Salmonella phan lap cd ddc life manh gay chd't chudt thi nghifm sau khi gdy n h i l m 85%
de'n 100% chudt trong vdng 72 gid
Lpn nai sinh san thai trif Salmonella typhimurium, tai Thai Nguydn cd 3 chiing;
Ha Tdy ed 2 chiing va Cao Blng cd 1 chung;
Salmonella choleraesuis vdi sd' lifu tUdng iing la 6 , 7 va 4 chung; thai trif Salmonella enteritidis la 2,0 va 1 chiing.
- Ldn eon sau cai sifa m l e bfnh phd thUdng ban do Salmonella typhimun'um va Salmonella choleraesuis. Khdng phan lap dupe Salmonella enteritidis tii ldn m l e bfnh.
TAI LIEU THAM KHAO
1. Andrijana Rajic, Juia Keenliside (2001).
Salmonella in Swine. Advances in Pork production. 2001. Volume 12.
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