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Covid‑19 origin and transmission to humans. Covid‑19 infection began in Wuhan (Hubei, China) in December, 2019. Although to date it is considered that Covid‑19 originates from bats (96.2% overall genome sequence identity) (1), the type of intermediate animals that caused the transmission to humans remains unknown (2-4). Zhou et al (1) mentioned that 'Direct contact with intermediate host animals or consumption of wild animals was suspected to be the main route of SARS‑CoV‑2 transmission. However, the source(s) and transmission routin

https://stairways.wiki/wiki/Ca....t_Flap_Cover_For_Win
provide the convenience of letting your pet come and go whenever they want without needing to open the doors or window for them. They are available in various materials and can be incorporated into windows, doors and walls. A professional tradesman is able to install a cat flap for any door, including wood, composite and uPVC. Installation Costs The cost to install the cat flap is different according to the type, size, and complexity of the project. The door or wall material can also affect the labour cost. For instance, installing