context: The study also found that there were two previously unknown but related clades (genetic branches) of the Y. pestis genome associated with medieval mass graves. These clades (which are thought to be extinct) were found to be ancestral to modern isolates of the modern Y. pestis strains Y. p. orientalis and Y. p. medievalis, suggesting the plague may have entered Europe in two waves. Surveys of plague pit remains in France and England indicate the first variant entered Europe through the port of Marseille around November 1347 and spread through France over the next two years, eventually reaching England in the spring of 1349, where it spread through the country in three epidemics. Surveys of plague pit remains from the Dutch town of Bergen op Zoom showed the Y. pestis genotype responsible for the pandemic that spread through the Low Countries from 1350 differed from that found in Britain and France, implying Bergen op Zoom (and possibly other parts of the southern Netherlands) was not directly infected from England or France in 1349 and suggesting a second wave of plague, different from those in Britain and France, may have been carried to the Low Countries from Norway, the Hanseatic cities or another site.
question: When did the y. pestis reach England?
answers: spring of 1349 1349 1349
content_span_normalized_text: surveys of plague pit remains in france and england indicate the first variant entered europe through the port of marseille around november thirteen forty-seven and spread through france over the next two years, eventually reaching england in the spring of thirteen forty-nine, where it spread through the country in three epidemics.
question_normalized_text: when did the y. pestis reach england?
context_asr: THE STUDY ALSO FOUND THAT THERE WERE TWO PREVIOUSLY UNKNOWN BUT RELATED CLADES GENETIC BRANCHES OF THE WHY PESTIS GENOM ASSOCIATED WITH MEDIEVAL MASGRAVES THESE CLADES WHICH ARE THOUGHT TO BE EXTINCT WERE FOUND TO BE ANCESTRAL TO MODERN ISOLATES OF THE MODERN WHY PESTED STRAINS WHY PE ORIENTALIS AND WHY PE MEDIEVALIS SUGGESTING THE PLAG MAY HAVE ENTERED ROP IN TWO WAVES SURVEYS OF PLAG PIT REMAINS IN FRANCE AND ENGLAND INDICATE THE FIRST VARIENT ENTERED ROPE THROUGH THE PORT OF MARY AROUND NOVEMBER THIRTEEN FORTY SEVEN AND SPREAD THROUGH FRANCE OVER THE NEXT TWO YEARS EVENTUALLY REACHING ENGLAND IN THE SPRING OF THIRTEEN FORTY NINE WHERE IT SPREAD THROUGH THE COUNTRY IN THREE EPIDEMICS SURVEYS OF PLAG PIT REMAINS FROM THE DUTCH TOWN OF BURGAN OSM SHOWED THE WY PESTIS GENAL TIP RESPONSIBLE FOR THE PANDEMIC THAT SPREAD TO THE LOW COUNTRIES FROM THIRTEEN FIFTY DIFFEREND FROM THAT FOUND IN BRITAI AND FRANCE IMPLYING BURGAN OPSOM AND POSSIBLY OTHER PARTS OF THE SOUTHERN NETHERLANDS WAS NOT DIRECTLY INFECTED FROM ENGLAND OF FRANCE IN THIRTEEN FORTY NINE AND SUGGESTING A SECOND WAVE OF PLAG DIFFERENT FROM THOSE IN BRITAIN AND FRANCE MAY HAVE BEEN CARRIED TO THE LOW COUNTRIES FROM NORWAY THE HANSIATIC CITIES OR ANOTHER SIT 
question_asr: WHEN DID THE WHITE BISTIS REACH ENGLAND 