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In,tensofthousandsofpeople

gatheredinSaudiArabia

fortheannualHajjpilgrimage.

Butwhatstartedoutasacelebration

ledtoahealthcrisis:

justafewdaysafterthepilgrimage,

morethan2,cases

ofmeningitisbrokeout

spreadingacrossSaudiArabia

andtherestoftheworld.

Theoutbreakwassofierce

thatitwasbelievedtohavesparkeda

waveofdeadlymeningitisepidemics

thatultimatelyinfectedtensof

thousandsofpeopleworldwide.

Meningitisistheinflammation

ofthemeninges,

threetissuelayersresponsiblefor

protectingthebrainandspinalcord.

Whatmakesmeningitissodangerous