Where is your secret easter bunny come from?

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Across
  1. 2. Microorganism causing beneficial effect when consumed
  2. 6. Agent which kills or inhibits growth of microorganisms
  3. 7. Colloquially multidrug resistant bacterium
  4. 9. Biological preparation that imrpoves immunity to a particular disease
  5. 10. Whole-body inflammation
Down
  1. 1. Genus of gram-positive anaerobic bacteria that cause diseases such as tetanus, botulism or pseudomembranous colitis
  2. 3. Phage DNA integrated into bacterial genome
  3. 4. Substance, that forms a complex with receptor
  4. 5. DNA vector
  5. 8. Father of microbiology