university of iowa, has been studying sars and mers for 30 years. >> 50% of people who have sars have antibodies now, which is 17 years later. so that would tell you maybe most of them are protected against sars again. for mers, the amount of antibody seems to decline fairly rapidly if you have mild disease. you have severe disease it lasts much longer. >> reporter: just like with mers, dr. pearlman believes more severe covid-19 symptoms may mean longer lasting immunity. >> so this disease, we think that you'll be protected at least for some amount of time, especially if you had pneumonia. if you had only the upper airway infection, you may get infected again. >> reporter: dr. pearlman said the good news is it isn't reinfecting. >> the virus isn't changing. >> reporter: what do you make of the korean cbc saying it may be reactivating in people they

thought were cured? >> the question is whether it really is reactivation or it's low-level infection that was not detected for a period of time and now is detected. >> reporter: martin hirsch of massachusetts general hospital agrees. he says genetics and several other factors affect immune response. >> younger people, healthy people without any underlying conditions are the most likely to develop prolonged antibodies. >> reporter: with covid-19, the world health organization says we need more evidence about how effective the antibodies are and how long immunity will last. >> when we're talking about this idea of potentially getting infected for a second time, what time frame would sound reasonable to you for that to make sense? >> i think those people who test positive then negative and then positive within a few days or a few weeks are almost certainly not re-infected. i think if you go beyond that, a few months, a few years, then

you can start talking about re-infection. >> reporter: antibody is not synonymous with immunity. antibody just tells you you've been infected before. immunity is more this complex idea. it's a continuum. and it depends on several things. it depends on the number of antibodies you produce, the type of antibodies you produce, so there are neutralizing antibodies. those are the ones we know work most effectively at neutralizing the virus. you want more of those. it also depends on other parts of the immune system. we have t-cells that work with the cells that make the antibodies that help and we have memory cells as well that make antibodies down the road when you see the virus again. >> that was a lot of science to digest. that was dr. tara narula reporting. the bottom line is we don't know if you can be reinfected. but that's one concern laying on the minds of thousands of boeing workers who returned to work last week. kris van cleave has the story. >> reporter: signs welcome back some of the 27,000 boeing

employees returning to work in washington state. they're finding a new normal of temperature checks, social distancing, enhanced cleaning procedures, staggered shifts to reduce crowding when people arrive and leave, required mask wearing and for workers who must be close together, they'll be issued p.p.e. >> i'm glad the boeing company is committing to very robust social distancing protocols and use of p.p.e. >> reporter: boeing says it will use contact tracing should someone come down with covid-19, but some like this triple 7 mechanic are worried. >> are we jumping the gun on this? most of them are apprehensive thinking it's too soon and they're worried. to be honest with you, they're very worried. >> reporter: for boeing it's back to work and filling orders and bring in much needed revenue. >> it's pretty clear people will be looking at boeing. this is one of the steps back to getting people working again. >> reporter: general motors employees volunteered to come back to work building

ventilators, requiring new procedures that if successful could be valuable lessons learned when it's time to >>afet is ourroducti iority we arngy stricocol as i r temperatures, screening, wearing masks. there's cleaning protocols from the start of shift to the end of shift. >> reporter: ford has hundreds back in factories building ventilators, making respirators and 3-d printing face shields. how do you keep your workers from getting each other sick? >> we have pre-screening in place. we will have physical separation for the employees when making our own face shield so we'll be using that. >> reporter: boeing officials tell cbs news the health and safety of their employees and their families is the company's priority and their measures are based on federal and state guidance. >> the "cbs overnight news" will be right back. when our daughter and her kids moved in with us...

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many of you are likely grappling with the challenges of working from home. well, consider this of the r. just imagine if your job was on another planet, such as driving the mars rover. chris martinez has the story. >> i'm matt. i'm going to show you my work from home set-up. >> reporter: matt gilener's work from home station at home looks relatively relatable for a job that certainly is not. >> i'm the lead rover driver. >> reporter: rover as in the mars curiosity rover, and gilener is now driving it on the red planet from his living room. he's part of a 30-plus person team that commands the spacecraft. and for the first time ever, all the rover's operations are being handled remotely from makeshift home command centers. >> i'm used to being able to t literally turnover my shoulder

and talk to a fellow rover driver. hey, what do you think of this plan i'm driving? instead i have to rely on screen sharing over network connections that sometimes can be slow. >> reporter: still, they're making it work. so well, in fact, that on the first day of remote operations, the team successfully commanded one of the rover's most complicated jobs. drilling a rock sample on mars. >> it's kind of an interesting change of pace being able to do the job while you have a pet 3 feet away, or you stop to make lunch in your own kitchen. >> reporter: the mission so far remaining mostly on schedule, thanks to the team's ability to adapt and their commitment to explore. chris martinez, cbs news, los angeles. >> the space may be the only place completely safe from the coronavirus. mark strassmann spoke to astronaut jessica mere who recently returned to earth after seven months on the international space station. >> reporter: from 250 miles

above earth, astronaut jessica mere practiced what you could call extreme social distancing. down below, a planet grappled with a contagion. >> there were only three people on the space station. it was difficult for us to understand. wow, we are of the 7 1/2 billion of humans 0 not earth, we are the only three people not affected by this. >> reporter: that changed a week ago. the capsule brought mere and teammates back to kazakhstan. they landed on a planet somewhat unrecognizable to the one they left. >> we came back to masked faces. >> reporter: was that your first corona reality check? >> yes. the people pulling us out of the capsule were wearing masks the the. those were the first humans we saw. >> reporter: while am orbit they achieved a milestone. they performed the first all female space walk last october. >> that is amazing. >> reporter: but long duration space missions compromise an astronaut's immune system. so when mere got back to houston

she went into quarantine. cook had to keep back. >> from a distance we could do a virtual hug. it's difficult for me. i'm a hugger. i've been up there seven months. it's difficult. >> reporter: they hope nasa will leave the virus behind. space exwill receive two astronaut, doug hurley and bob to the international space station. they will become the first americans launched from u.s. soil since 2011 when the space shuttle retired. but the corona threat may block their families from watching in person. >> i would have said emphatically yes a few weeks ago. i think we're all just one day at a tiat this point. if not, they'll have to watch it from home potentially. i hone evidently don't know. >> reporter: jim, nasa's administrator, told us this launch will be different. >> instead of descending on the kennedy space center, this time what we're asking people to do is tune in. watch it on tv. watch it on the internet.

stay at home. this is a moment in time when all of america can come together in the midst of a pandemic and celebrate something positive. >> reporter: as for jessica mere, she has something to celebrate. after a week in a quarantine facility, she gets to sleep in her own bed tonight. do you feel more isolated now than you did when you were orbiting the earth? >> yeah, i do. and i think that will come out even more once i do go home. on the space station you're expecting that kind of isolation. that's just part of the experience. we train for it. we know it's there. here on earth, we're not used to that. >> reporter: like all of us, she's getting used to a different world. mark strassmann, atlanta.

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a lot of states are relaxing their social distancing guidelines this week, but for the rest of the country, maintaining a safer distance from others while at the same time maintaining our sanity has become an art form. >> reporter: they set up in i an empty lot and made their way down a river bank just as dawn was breaking. their boats hit the water at the same time as the sun. >> it's a great time to paddle so it's super pretty. sunrising, everything is kind of fresh. >> my favorite thing about being on the water is it makes iteel likeinwr an it is, you know, just as

beneficial mentally as it is physically. >> reporter: erin and joe drove an hour outside of washington to find this peaceful part of the potomac. it lets them ride the rapids without others around. >> if you're too close to me, i'm going to hit you with the paddle. >> reporter: that's a really aggressive method of social distancing. >> it's effective. i have to meet those cdc guidelines. >> reporter: americans are heading outside to take a breath, a breath or just a momt toth bu the crowds can make it hard to social distance. and not everyone understands the need for personal space. which is why kristin hits the track early. really early. >> i work at a clinic at 7:30 in the morning so in order to avoid the crowds and still get my workout in, i go before instead of after. >> reporter: she said sticking to a routine helps her cope with

covid-related stress. >> it's one of the few things we still can do. i can go run in my favorite places. that means a lot to me. >> reporter: with favorite places too packed during the day, these friends have been waiting until after dark to escape their apartments. riding bikes around d.c. and the deserted national mall. >> it's nice riding bikes around the city, even when something like this isn't happening. it's a great way to see the city and a great way to see the monuments at night. >> the first time we ever did this, it was the first time things felt peaceful and didn't feel stressful. >> reporter: and those off-hour outings can have other unexpected perks. >> it was the first time i ever perceived the sky at night in the city. w nicit was therapeutic for su. >> reporter: of course, it's always been there, the sky above the city. it just took a pandemic to see the stars. christina ruffini, washington. >> that is the overnight news for this tuesday. reporting from washington, i'm jeff pegues.

.♪ ♪ saptioning sponsored by cbs >> o'donnell: tonight, quarantine fatigue. as the death toll in the u.s. passes 55,000, 19 states loosen restrictions. the governor of california today vows to take action after pictures showing packed beaches. in chicago, outrage after a video shows a house party with hundreds inside. and what cell phone data reveals if americans are still staying home. ramping up testing. three months into the crisis, the president unveils what he's calling a blueprint for nationwide testing. and, why president trump is suggesting some schools open this academic year. c ere's the money? today, small businesses get the chance again to apply for help. the federal