What does ISIS stand for?

International Study of Infarct Survival

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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International Satellites for Ionospheric Studies International School of Information Science International Science Information Service International Security Information Service International Society on Infant Studies International Species Information System International Species Inventory System International Spinal Injection Society (now International Spinal Intervention Society) International Spinal Intervention Society (formerly International Spinal Injection Society) International Splined Interface Standard (bicycle crank and bottom bracket interface)		International Superconductivity Industry Summit Internet Shopping Is Safe Internet Student Information System Interoperability and Standardization of Information Systems Investigative Support Information System Iowa Student Information System (University of Iowa) Isochronal Scheduled Inspection System Italian Silicon Sphere Intermediate System to Intermediate System-Traffic Engineering International Small Islands Studies Association

Samples in periodicals archive:

The Second International Study of Infarct Survival involved more than 17,000 persons who had suffered heart attacks.

On the other hand...

In the Second International Study of Infarct Survival involving more than 17,000 men and women, findings suggested that low-dose aspirin specifically reduced patients' risk of experiencing a non-fatal stroke by 46 percent.

Low-Dose Aspirin Aids in Stroke Survival