Visas and Invitation Letters


If you are planning to travel to the United States and live in a country that requires a Visa, we urge to apply for one as early as possible. Below are suggestions to help you secure a Visa.

  • Apply at the appropriate location at least 5 months before intended travel.  You can check on-line for the wait times for appointments.
  • Be prepared to allow inkless fingerprinting and digital photographs upon entry to the US.
  • Be accurate and specific in completing your application. Avoid mistakes. If needed, attach an additional explanation letter.
  • Attach evidence of your previous visits to the United States and of your intended return trip to your home country.
  • Acquire a police clearance, if possible.
  • Bring all documentation proving your home country connections. Suggestions include: past visas, bank accounts, family, professional position, home ownership, and marriage license.
  • If you are presenting a paper or speaking at the meeting or are receiving and award or grant, bring copies of correspondence confirming that.
  • Bring your letter of invitation from AACC.

Click here for information on Temporary Visas to participate in an AACC meeting or other temporary travel to the United States.

Click here for the United States Visa application procedures.

Note:  A Visa only allows you to travel to the US.  You will still have to be admitted at your point of entry.  Click here for information from Homeland Security on the Entry Process. Click here for a description from U.S Customs and Border Protection of the process for entering the United States.

Additional Information: U.S. visa policy permits citizens of certain countries to travel to the U.S. without a visa, when they meet certain requirements, under U.S. laws. Please click here for more information about which counties participate in the Visa Waiver Program.

The National Academy of Science has established an International Visitors Office with travel information specifically designed for scientists traveling to the US.

Invitation Letters

All AACC letters of invitation are only provided to attendees who are planning to participate and attend an AACC-related conference or event.

You will need to provide the following information in your request:

  • Your full name (Family name and given name)
  • Degree (M.D., Ph.D, etc.)
  • Job Title (Professor, Lab Director, etc.)
  • Organization
  • Full mailing address
  • Name of the event you plan to attend

Click here to request a letter of invitation.You will be able to print a .pdf file of your invitation letter.

In some cases, Visa Offices will not accept electronically transmitted invitation letters.  If you also need AACC to mail a letter of invitation:

  1. Click above to request a letter of invitation
  2. Send an email to us requesting that we mail you a copy of your invitation letter. Include your full name, city, country, and the name of the event you plan to attend.
  3. Important: Letters of invitation will be sent via regular mail unless you provide a Federal Express or DHL account number.
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