4025
However , there was a difference in the quality of immunity : fever and body weight loss were seen in hamsters vaccinated with the killed - toxoplasma vaccine after they were challenge exposed with T - 1 strain , whereas these changes were rarely seen in hamsters given the live - toxoplasma vaccine and then challenge exposed with RH strain .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None