"Director Fury, Tony and I have identified the toxin... Its an altered form of the venom from a snake known as the 'Latifi's Viper'"
"Tell me there's an antidote"
"We're working on it sir, the alterations made to the venom make it much more potent, we're trying to alter the antidote to take that into account. The levels in Natasha's blood are dangerously high; its at 65 mg; normally 40 would be lethal but the adjustments made to it makes it more effective, more deadly. Its a miracle she's still alive. The levels in Clint's blood are lower; around 20 mg"
"Banner, get me that cure before its too late"
"Right away Fury. But there's something else you should know... The Latifi's Viper is an endangered species, extremely rare, only found in certain remote areas of Iran..."
"Iran?"
"Yes sir"
"Nazari!"
"That was our thinking"
"Right, I need that antidote in Chicago now Banner"
"You got it sir, we'll be there as soon as we can!"
Steve returned to SHIELD, he had several hours until he needed to meet the waitress and felt guilty at having to leave Clint and Natasha.
When he entered the medical bay his eyes went wide. Natasha was clammy and pale; in the mist of a seizure. Her heart was racing, Steve was no doctor but even he could tell her heart rate was dangerously high (reading at 173 bpm on the machines by her bedside). Doctors were trying to give her drugs to slow it down, but they didn't seem to be working.
In contrast to the panic and activity surrounding Natasha; Clint looked almost peaceful. He breathed calmly in an even rhythm, his face serene; a stark contrast to the pain etched on Natasha's. The seizures clearly hadn't hit him yet either; his hands and feet weren't strapped down like his partners. An oxygen mask was placed loosely over his face so it was also obvious his breathing hadn't become compromised like hers either.
Steve silently crossed the room, taking a seat next to Clint, he'd only be shooed away by one of the many doctors or nurses if he tried to get near Natasha. With a deep sigh he rested his head in his hands and prayed.
Steve was awoken some time later with an awful pain in the pit of his stomach; it felt like acid burning its way through his organs, so bad it wrenched him from his deep sleep. He fell to the floor clutching his abdomen; eyes watering in agony. His throat burned with every breath, the air seeming to get thicker and harder to inhale. The room span and sweat ran down his face, he had no strength to get back up. If he'd been hit with the same thing as Natasha and Clint he really felt for them; this was by far the most pain he'd ever felt, and he suspected the serum was preventing him feeling the worst effects.
Hill entered the medical bay to find Steve splayed on the floor, breathing harshly and gripping his stomach.
"Rogers? Rogers!"
"Just... G-gimme a minute..." He panted. Desperately trying to compose himself.
"What time... Is it?"
"Its half 9, why?"
"Dammit! I g-gotta get... back into t-town"
"I don't think you're in a state to go anywhere!" Maria said, helping him to stand. He leaned on her more than she'd expected; almost causing her to buckle under his weight.
"Sit down" she instructed, aiming him at the chair before the weight became too much.
"Stark and Banner are on their way back, they think they have the antidote"
"Maria, there's a waitress... She knows something about Nazari... I was s-supposed to meet her..."
"Where?"
"The cafe"
"Ill go. Stay here, i'll get a nurse"
"I'm fine. Stay safe"
