Pope Francis baptises babies in Sistine Chapel in Vatican City

While Francis has been vaccinated, Iraq has been gripped by a second wave with a record of over 5,000 new cases a day, prompting authorities to impose full lockdowns during the pontiff's visit. Security will be tight in Iraq, which has endured years of war and insurgency, is still hunting for Islamic State sleeper cells, and days ago saw a barrage of rockets plough into a military base. Francis will preside over a half-dozen services in ravaged churches, refurbished stadiums and remote desert locations, where attendance will be limited to allow for social distancing.

Inside the country, he will travel more than 1,400 kilometres (870 miles) by plane and helicopter, flying over areas where security forces are still battling IS remnants. For shorter trips, Francis will take an armoured car on freshly paved roads that will be lined with flowers and posters welcoming the leader known here as "Baba Al-Vatican". The pope's visit has deeply touched Iraq's Christians, whose numbers have collapsed over years of persecution and sectarian violence, from 1.5 million in 2003 to fewer than 400,000 today.

"We're hoping the pope will explain to the government that it needs to help its people," a Christian from Iraq's north, Saad al-Rassam, told AFP. "We have suffered so much, we need the support." The first day of the pope's ambitious itinerary will see him meet government officials and clerics in the capital Baghdad, including at the Our Lady of Salvation church, where a jihadist attack left dozens dead in 2010. He will also visit the northern province of Nineveh, where in 2014 IS jihadists forced minorities to either flee, convert to Islam or be put to death.

"People had only a few minutes to decide if they wanted to leave or be decapitated," recalled Karam Qacha, a Chaldean Catholic priest in Nineveh. "We left everything -- except our faith." Some 100,000 Christians -- around half of those who lived in the province -- fled, of whom just 36,000 have returned, according to Catholic charity "Aid to the Church in Need". Among the returnees, a third have said they want to leave again in coming years, dismayed by Iraq's rampant corruption, persecution and poverty, which now affects 40 percent of the population.