1. Website: Check the official website of the Cochin Port Health Organisation for information on vaccination services and contact details.
2. Phone: Call the Cochin Port Health Organisation during their office hours to inquire about yellow fever vaccination availability on Saturdays.
3. Email: Send an email to the Cochin Port Health Organisation with your enquiry.
Remember that the availability of vaccination services can change, so it's always a good idea to confirm the information before making any plans.