Age: 18.0
Sex: M
Vaccine: COVID19, COVID19
Symptoms: Asthenia, Muscle contractions involuntary, Paraesthesia
Clinical narrative: 10:00 pm on 9/9/21:  Two and a half hours after receiving the Janssen COVID-19 vaccine, my legs started to become increasingly sore and tight. Because I had not done any intense physical activity earlier that day or the day prior, I was quite confused as to why these symptoms were occurring.  Since my legs felt sore, I attempted to stretch them to alleviate the soreness.  Unfortunately, this did not work; so, I decided to sleep instead.    9:00 am on 9/10/21: The following morning, along with my leg soreness (like feeling nervous before giving a public speech), I felt intense muscle contractions in numerous regions of my legs (particularly, my calves and thighs: anterior and posterior).  These muscle contractions would vary in quality (strength of contraction) and quantity (number of contractions per event and frequency of each event occurring).  For the most part, the muscle contractions (spurt of two or three contractions) would last two seconds and occur every ten seconds.  Regarding where the muscle contractions would occur, it was completely random: no distinct pattern of event location (besides the general regions of my calves and thighs: anterior and posterior).  Also, I realized that the muscle contractions only occurred while I remained stationary (i.e., sitting or lying down); in contrast, when I was standing or moving around on my feet, I would not feel any muscle contractions (although, I still felt slight leg soreness while standing).    9/11/21-9/12/21: Symptoms remained the same as 9/10/21  9/13/21: On the thirteenth, my symptoms vastly increased: in terms of overall discomfort.  The quality (strength: more intense contractions) and quantity (time span of each event: event length increased (>two seconds) and occurred more frequently (<ten second apart)).  I also developed shin splint-like symptoms throughout the day, which subsided the following day.    9/14/21: My symptoms (soreness and muscle contractions) returned to a similar level described on 9/10/21.   9/15/21: On this day, I noticed that the symptoms had been gradually improving but still quite noticeable.  I decided to visit my Doctor, who gave me a physical examination to evaluate my reflexes.  Upon checking my involuntary reflexes (i.e., knee and hand/finger(s)), everything came back normal.  Following the involuntary reflex test, he had me close my eyes and report if the given object was sharp or dull when touching my foot: to examine my neurological response to a specific stimuli.  Again, the test came back normal: meaning I had responded correctly.    9/17/21: My symptoms (soreness and muscle contractions) continued to gradually improve (soreness was decreasing, muscle contractions were less powerful and less prevalent (in length of occurrence and regularity), although no extremely major improvements were felt.  That same day, I noticed that my symptoms had progressed slightly to my arm (specifically my tricep): where I felt more soreness than muscle contractions in my arm.  My tricep soreness went away the next day.    9/18/21: My symptoms then progressed slightly to my back (only felt muscle contractions around my shoulder blade and no muscle soreness in my back).   Also, my symptoms of muscle contractions and soreness in my legs remained the same as the previous day.      Since then, the soreness (can be a variation of shin splints, growing pains, or tightness) in my legs seems to vary day after day: and still causes discomfort.  The muscle contractions are still prevalent in my legs, along with other areas of my body (previously mentioned): although, muscle contractions in other areas of my body are not as common.