A scientist uses the electron microscope. 



PN-3650 



for personnel, animals, and supplies are strictly 

 controlled. Persons must change to laboratory 

 clothing upon entering the building. Upon 

 leaving, they must take a decontaminating 

 shower before putting on their own clothing. 



Exhaust air from these buildings is decontami- 

 nated through a system of filters, and all liquid 



PIN-3651 



A technician inoculates chicken egg embryos to detect 

 virus. 



PN-3652 



Foreign scientists observe a rapid diagnostic test for 

 African swine fever. 



