Maryland Department of Health
Center for Immunization

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Maryland Immunization Information System (ImmuNet)

Please note that ImmuNet will be down the following dates/times (in EDT):

    • Wednesday, 10/15/2025 - ​ImmuNet is scheduled to be down from 6:00 pm to 6:30 ​pm​ to restart the RDS/datamart (to improve ImmuNet response time).
    • Monthly maintenance every 2nd Saturday of the month from 5:30 pm to 9:30 pm.
Please plan your work accordingly for these downtimes.​

When ImmuNet is back up each time, be sure to clear your cache and refresh the page (go to your browser history to clear your browsing history - CTL-SHIFT-DEL in Chrome) before you sign in at mdimmunet.org​.

Thank You!​