ASO or antistreptolysin Latex source

[Stan Orrell]

We would appreciate any information about a material called 
ASO-Latex, I believe, which is used as an immunologic reagent 
for the determination of antistreptolysin.  We are interested 
in purchase of large quantities from the maker.

We have a possible name, Leroi, or similar, but have no contact 
information.  

Since I am a physicist, working with a microbiologist in a third 
world country, please forgive any displayed ignorance.  I will be 
much obliged for any leads.

Thanks for any help,

Stan  i.e.  Stan Orrell  sao at nmia.com  or  sorrell at triton.unm.edu