From Japan Red Cross website at 3/31/21 and 4/13/21:

Those who have received vaccinations within a certain period of time.

Those who have received inactivated vaccines for influenza, Japanese encephalitis, cholera, hepatitis A, pneumococcus, pertussis, tetanus, etc. and toxoids are not allowed to donate blood for 24 hours after vaccination.

Those who have received hepatitis B vaccine are not allowed to donate blood for 2 weeks after vaccination, those who have received anti-HBs human immunoglobulin alone or in combination are not allowed to donate blood for 6 months after administration, and those who have received rabies vaccine (after being bitten by an animal) are not allowed to donate blood for 1 year after vaccination.

Those who have been vaccinated against mumps, rubella, BCG, and other weakly poisonous live vaccines are not allowed to donate blood for 4 weeks after vaccination, those who have been vaccinated against smallpox are not allowed to donate blood for 2 months after vaccination, and those who have been vaccinated against tetanus, snake venom, gas vesicles, and botulism are not allowed to donate blood for 3 months after administration.

Those who have been vaccinated against new coronaviruses are not allowed to donate blood for the time being.

If you have had a specific disease If you are sick on the day of the donation, taking medication, or have a fever If you have or are suspected of having AIDS, hepatitis, or other viruses If you are pregnant or nursing If you have had a blood transfusion or organ transplant If you have had a piercing within the past 6 months. If you have had a mouse implant within the past 6 months. If you have a trauma. If you have been bitten by an animal or a person. Those who have received vaccinations within a certain period of time. Those who have received dental treatment (including tartar removal) that involves bleeding. Those who have traveled or lived abroad. Those who have or are suspected of having Creutzfeldt-Jakob disease (CJD).

一定期間内に予防接種を受けた方

一定期間内に予防接種を受けた方

インフルエンザ、日本脳炎、コレラ、A型肝炎、肺炎球菌、百日ぜき、破傷風等の不活化ワクチンおよびトキソイドの接種を受けた方は、接種後24時間の献血をご遠慮いただいています。

B型肝炎ワクチンの接種を受けた方は接種後2週間、抗HBs人免疫グロブリンを単独または併用した方については投与後6カ月間、狂犬病ワクチン（動物にかまれた後）を接種された方は接種後1年間の献血をご遠慮いただいています。

おたふくかぜ、風疹、BCG等の弱毒生ワクチンの接種を受けた方は、接種後4週間、天然痘ワクチンの接種後は2カ月間、破傷風、蛇毒、ガスえそ、ボツリヌスの抗血清の投与を受けた方は投与後3カ月の献血をご遠慮いただいています。

新型コロナウイルスのワクチンを接種された方は、当面の間、献血をご遠慮いただいています。

Translated with www.DeepL.com/Translator (free version)