If it is for a journal article, it is not uncommon to leave author affiliations in the original language. Here are several links where this has been done.

http://vet.sagepub.com/content/46/4/636.full.pdf

http://www.springerlink.com/content/m4m7w0m1v64nx873/

http://onlinelibrary.wiley.com/doi/10.1111/j.1865-1682.2010....

http://www.medvetnet.org/cms/templates/doc.php?id=381

http://www.ingentaconnect.com/content/pres/jcs/2006/00000044...

http://www.proz.com/kudoz/italian_to_english/economics/63523...

Excerpts from a EU document in which one such Istituto (there are a dozen scattered around the country, this particular one being in the Abruzzo) is mentioned,
'(4) L’Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise "G. Caporale", di Teramo, Italia, centro per la formazione veterinaria, l’epidemiologia, la sicurezza alimentare e il benessere degli animali che collabora con l’organizzazione mondiale per la salute animale (OIE) sta elaborando...

(4) The Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise "G. Caporale", Teramo Italy, that is a World Organisation for Animal Health (OIE) Collaborating Center for Veterinary Training, Epidemiology, Food Safety and Animal Welfare is in the process of establishing...'
(http://eur-lex.europa.eu/Notice.do?mode=dbl&lang=it&lng1=it,...

In this document excerpt, the OIE mentions the Brescia institute by acronym only (IZSLER > Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna),
'To validate the custom-made ELISA approximately 700 sera from naïve, vaccinated and infected animals were collected. In collaboration with researchers at the IZSLER institute, Brescia, Italy we are in the process of validating the NSP ELISA, to be used in the differentiation of infected from vaccinated animals, specific for the African context.'
(www.oie.int/eng/oie/.../1.../FOOT_MOUTH_DIS_SOUTH_AFRICA.do...

More untrranslated examples here,
www.aseanfood.info/scripts/count_article.asp?Article_code=1...


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Note added at 1 hr (2011-01-05 15:22:25 GMT)
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Last 'untrranslated' should read 'untranslated' (sorry)

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Note added at 1 hr (2011-01-05 15:33:19 GMT)
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Here's a translation from the homepage of the Piedmont/Liguria 'istituto' (http://www.izsto.it/)

'L'Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d'Aosta fornisce prodotti e servizi per difendere la salute del cittadino attraverso la sicurezza degli alimenti e la salute degli animali che li producono.

The Veterinary Medical Research Institute for Piemonte, Liguria and the Valle D’Aosta (IZS) supplies products and services for safeguarding public health, through control programmes for food safety and animal health.'

This Institute explains the kind of research in an English webpage, I would leave as is with explanation