Mae'r Asiantaeth wedi cyhoeddi cyngor newydd sy'n nodi bod cysylltiad posibl rhwng Brechlyn COVID-19 AstraZeneca a ffurf eithriadol o brin o glotiau gwaed. Mae'r risg yn fath penodol a phrin iawn o glot gyda chyfrif platennau isel (a elwir yn thrombosytopenia). Mae manteision brechu yn parhau i fod yn fwy nag unrhyw risgiau ond mae’r Asiantaeth yn cynghori y dylid rhoi ystyriaeth ofalus i bobl sydd mewn mwy o berygl o gael mathau penodol o glotiau gwaed oherwydd cyflyrau meddygol.
The MHRA has issued new advice concluding there is a possible link between AstraZeneca COVID-19 Vaccine and extremely rare form of blood clots. The risk is of a very specific and very rare type of clot with a low platelet count (known as thrombocytopenia). The benefits of vaccination continue to outweigh any risks but MHRA advises careful consideration be given to people who are at higher risk of specific types of blood clots because of their medical condition.