for seven days before immersion. Today, the law of zavah remains in effect in Orthodox Judaism, in two respects. Due to extreme conditions in Roman Palestine in the time of the Amoraim, women's periods became irregular, and women became unable to determine whether or not their discharges were regular (niddah) or irregular (zavah). As a result, women adapted a stringency combining the niddah and zavah periods, refraining from intercourse and physical contact with their husbands for seven days of the zavah period following menstruation, for a total of approximately 12 days per month, which Orthodox women continue to observe today. The laws of zavah are also applied, as in Biblical times, to uterine blood discharges outside regular menstruation. Such circumstances are often interpreted leniently, however, and rabbinic stratagems have been devised to lessen their severity. Women experiencing irregularities (droplets) are sometimes advised to wear coloured underwear to mitigate the detectability of evidence of zavah status and hence a need to determine that a woman is a zavah. Keri Men experiencing a seminal discharge, including through regular marital intercourse, were prohibited from entering the Temple in Jerusalem and required to immerse in a mikveh, remaining ritually impure until the evening. The Talmud ascribes to the Great Assembly of Ezra a Rabbinic decree imposing further restrictions on men ritually impure from a seminal discharge, including a prohibition on studying Torah and from participating in services. Maimonides wrote a responsum lifting the decree of Ezra, based on an opinion in the Talmud stating that it had failed to be observed by a majority of the community and the Jewish people found themselves unable to sustain it. However, Maimonides continued to follow the Keri restrictions as a matter of personal observance. Since then, observance of the rules of Keri and hence regular mikveh use by men fell into disuse in many communities. Hasidic Judaism, however, revived the practice of regular mikveh use, advocating regular daily mikveh use as a way of achieving spiritual purity. The growth of Hasidic Judaism resulted in a revival of mikveh use by men. In addition, some Sephardic and Mizrahi communities continued to observe the rules of keri throughout. Contact with an animal carcass According to Leviticus, anyone who comes into contact with or carries any creature that had not been deliberately killed by shechita was regarded by the biblical regulations as having made themselves unclean by doing so, and