3848
The absolute numbers and the percentages of T lymphocytes and of natural killer cells , and the levels of TNF - alpha were higher than the controls , whereas IgG and IgM levels were found to be lower in workers .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None