5 Min Read LONDON (Reuters) - A surge in emerging markets linked to the success of COVID-19 vaccines may not fully reflect the challenges of delivering scarce supplies to some of the world’s poorest countries, suggesting a bumpy 2021 for investors in the asset class. FILE PHOTO: Vials labelled "COVID-19 Coronavirus Vaccine" are placed on dry ice in this illustration taken, December 5, 2020. REUTERS/Dado Ruvic/Illustration The vaccine rollout is already shaping up to be the investment theme of the year. Israel’s early immunisation campaign has helped the shekel hit 24-year highs and aided local stocks, while Chile’s peso has gained 1.3% over the past month, helped by its push to finish vaccination by the second quarter.