- 5 May 2013
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The first article is speculation with no data, apparently based on nothing more than the universal fact that acquired immunity to viruses isn't permanent but fades over time (normally years in otherwise healthy individuals; it's also not all or nothing, your immune system remembers how to produce a specific antibody for considerably longer than it is circulating that antibody in numbers large enough to provide total immunity).
The second article "raised questions" of re-infection but is believed to be dormancy and relapse.
Neither article seems to contain any compelling information to suggest that COVID-19 has any special properties for evading the immune system response.