33
/
AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
October 1, 2025
Create a timeline
Public Timelines
For education
For educational institutions
For teachers
For students
Cabinet
For educational institutions
For teachers
For students
Open cabinet
FAQ
Get premium
Close
Create a timeline
Public timelines
Library
FAQ
About & Feedback
Terms
Privacy
Library
FAQ
Support 24/7
Cabinet
Get premium
Donate
The service accepts bank transfer (ACH, Wire) or cards (Visa, MasterCard, etc). Processed by Stripe.
Secured with SSL
Edit
Download
Export
Duplicate
Premium
Embed
Share
polio
Category:
Other
Updated:
26 Nov 2017
1
0
452
Contributors
Created by
Sophie
Attachments
Comments
eee
By
Sophie
26 Nov 2017
0
0
487
Events
Polio was the most feared disease of this time.
Jonas Salk announced that he was developing a trial vaccine for polio.
The Salk vaccine was tested on 1.8 million schoolchildren.
About & Feedback
Terms
Privacy
Library
FAQ
Support 24/7
Cabinet
Get premium
Donate
The service accepts bank transfer (ACH, Wire) or cards (Visa, MasterCard, etc). Processed by Stripe.
Secured with SSL
Comments