Effects of preservation conditions on the survival numbers of seven Brucella strains preserved in 30%glycerol brain heart infusion medium
10.3969/j.issn.1002-2694.2025.00.148
- VernacularTitle:不同保藏条件对7株30%甘油-脑心浸液培养基保藏布鲁氏菌存活数的影响研究
- Author:
Yu FAN
1
;
Hongyan ZHAO
1
;
Qingqing XU
1
;
Kun LI
1
;
Guozhong TIAN
1
;
Hai JIANG
1
;
Lanyu LI
1
;
Dongri PIAO
1
Author Information
1. 中国疾病预防控制中心传染病预防控制所,北京 102206
- Publication Type:Journal Article
- Keywords:
Brucella;
brain heart infusion medium;
strain preservation;
survival number;
stability test
- From:
Chinese Journal of Zoonoses
2025;41(9):945-951
- CountryChina
- Language:Chinese
-
Abstract:
This study was aimed at comparing the effects of storage conditions on the Brucella survival number in brain heart infu-sion medium,to provide experimental data support for the selection of storage conditions for Brucella strains.We created bacterial sus-pensions of seven strains of Brucella melitensis,Brucella abortus,and Brucella suis(denoted A,B,C,D,E,F,G)by using 30%glycerol brain heart infusion medium,then conducted stability testing.For accelerated stability tests,the bacterial solution was placed in a 37℃chamber for 1,2,3,or 4 weeks continuously,and the Brucella survival number at each time point was measured.For freeze-thaw stability testing,the bacterial solutions were frozen at-80℃,transferred to room temperature for 4 hours,and melted in one freeze-thaw cycle,and the Brucella survival number was measured for 2,4,6,and 8 freeze-thaw times.For long-term stability testing,the bacterial solutions were stored at-80℃,and the Brucella survival number was measured at various time points during the first,third,sixth,and twelfth months of storage.A line graph was plotted to demonstrate the changes in Brucella survival number at each time point in the three stability tests.IBM SPSS Statistics 22 software was used to assess statistically significant differences in Brucella survival number at each time point and the initial Brucella survival number.Accelerated stability tests showed that the Bru-cella survival number of the seven strains significantly decreased,and a statistically significant difference in Brucella survival number was observed after 1 week.In freeze-thaw stability tests,with increasing freeze-thaw times,the Brucella survival number of the seven strains showed a decreasing trend.Strains C and F showed statistically significant differences with respect to the initial Brucella sur-vival number after two times of freeze-thaw;strains A and D showed statistically significant differences with respect to the initial Bru-cella survival number after four times of freeze-thaw;strain G showed statistically significant differences with respect to the initial Bru-cella survival number after six times of freeze-thaw;and strain E showed statistically significant differences with respect to the initial Brucella survival number after eight times of freeze-thaw.The data for strain B showed abnormalities.In long-term stability testing,the Brucella survival number for strains C and F after storage for 1 month showed a statistically significant difference with respect to the initial bacterial solution.No statistically significant difference in Brucella survival number was observed for strains B and E after stor-age for 1,3,6,or 12 months.The data for strains A,D,and G showed abnormalities.The sterile 30%glycerol brain heart infusion medium maintained the Brucella survival number in an-80℃environment,and freezing and thawing multiple times should be avoided.Compared with the traditional freeze-drying method,this method is not only easy to perform but also avoids potential bio-safety hazards,and provides a reliable Brucella culture preservation scheme for researchers in related fields.
