Panama Canal shot question

In January were going on a Partial Canal cruise. Visiting ports in Panama, Columbia, and Costa Rica. Will we need shots for the Zika virus or Malaria?

No malaria shots

There are no shots available for Zika. Use deet bug protection. This CDC information may be helpful

https://www.cdc.gov/zika/prevention/index.html

In January were going on a Partial Canal cruise. Visiting ports in Panama, Columbia, and Costa Rica. Will we need shots for the Zika virus or Malaria?

Shots are not a requirement as of this writing. Suggest you check with Princess a couple of months before your cruise.

We've done 2 full transits and no "shots" were required for any of the countries we visited.

You do not need shots, but more relevant is the fact that vaccines do not exist for either of the diseases you are asking about.

We did a full transit a while back and never even saw a mosquito.

See the CDC Yellow Book recommendations for travelers to Panama

https://wwwnc.cdc.gov/travel/destinations/traveler/none/panama